isNil => a$nil

CHANGELOG

@@ -1,3 +1,11 @@
+? April 2017 - Release 0.18.6
+===================================
+
+* Internal `.isNil` deprecated in favour of `.a$nil`.
+
+Commits: https://lolg.it/amber/amber/commits/0.18.6.
+
+
 7 April 2017 - Release 0.18.5
 ===================================
 

external/amber-cli/src/AmberCli.js

@@ -491,7 +491,7 @@ self._writeConfigThenDo_((function(err){
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 return $core.withContext(function($ctx2) {
 //>>excludeEnd("ctx");
-if(($receiver = err) == null || $receiver.isNil){
+if(($receiver = err) == null || $receiver.a$nil){
 return $recv(process)._exit();
 } else {
 return $recv(process)._exit_((111));
@@ -579,7 +579,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@basePath"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $recv(self._class())._defaultBasePath();
 } else {
 return $1;
@@ -1040,7 +1040,7 @@ $3=$recv($recv(aRequest)._headers())._at_("authorization");
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["at:"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $3) == null || $receiver.isNil){
+if(($receiver = $3) == null || $receiver.a$nil){
 header="";
 } else {
 header=$3;
@@ -1056,7 +1056,7 @@ $4=$recv(header)._tokenize_(" ");
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx2.sendIdx["tokenize:"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $4) == null || $receiver.isNil){
+if(($receiver = $4) == null || $receiver.a$nil){
 token="";
 } else {
 token=$4;
@@ -1267,7 +1267,7 @@ self._respondFileNamed_to_($3,aResponse);
 } else {
 $5=$recv($recv(aUrl)._pathname()).__comma("/");
 $7=$recv(aUrl)._search();
-if(($receiver = $7) == null || $receiver.isNil){
+if(($receiver = $7) == null || $receiver.a$nil){
 $6="";
 } else {
 $6=$7;
@@ -1650,7 +1650,7 @@ $recv($1)._stat_then_($2,(function(err,stat){
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 return $core.withContext(function($ctx2) {
 //>>excludeEnd("ctx");
-if(($receiver = err) == null || $receiver.isNil){
+if(($receiver = err) == null || $receiver.a$nil){
 $3=$recv(stat)._isDirectory();
 if(!$core.assert($3)){
 $4=console;
@@ -2078,7 +2078,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@mimeTypes"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@mimeTypes"]=self._defaultMimeTypes();
 return self["@mimeTypes"];
 } else {
@@ -2466,22 +2466,22 @@ self._gruntInitThenDo_((function(error){
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 return $core.withContext(function($ctx2) {
 //>>excludeEnd("ctx");
-if(($receiver = error) == null || $receiver.isNil){
+if(($receiver = error) == null || $receiver.a$nil){
 return self._bowerInstallThenDo_((function(error2){
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 return $core.withContext(function($ctx3) {
 //>>excludeEnd("ctx");
-if(($receiver = error2) == null || $receiver.isNil){
+if(($receiver = error2) == null || $receiver.a$nil){
 return self._npmInstallThenDo_((function(error3){
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 return $core.withContext(function($ctx4) {
 //>>excludeEnd("ctx");
-if(($receiver = error3) == null || $receiver.isNil){
+if(($receiver = error3) == null || $receiver.a$nil){
 return self._gruntThenDo_((function(error4){
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 return $core.withContext(function($ctx5) {
 //>>excludeEnd("ctx");
-if(($receiver = error4) == null || $receiver.isNil){
+if(($receiver = error4) == null || $receiver.a$nil){
 self._finishMessage();
 return $recv(process)._exit();
 } else {
@@ -2620,7 +2620,7 @@ var varName,value;
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 return $core.withContext(function($ctx2) {
 //>>excludeEnd("ctx");
-if(($receiver = name) == null || $receiver.isNil){
+if(($receiver = name) == null || $receiver.a$nil){
 varName=self._nextResultName();
 } else {
 varName=name;
@@ -2633,7 +2633,7 @@ $recv((function(){
 return $core.withContext(function($ctx3) {
 //>>excludeEnd("ctx");
 $2=$recv(varName).__comma(" := ");
-if(($receiver = expr) == null || $receiver.isNil){
+if(($receiver = expr) == null || $receiver.a$nil){
 $3=buffer;
 } else {
 $3=expr;
@@ -3024,7 +3024,7 @@ $1=$recv(aClass)._superclass();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["superclass"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $recv(aClass)._instanceVariableNames();
 } else {
 $2=$recv(aClass)._instanceVariableNames();
@@ -3103,7 +3103,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@resultCount"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@resultCount"]=(1);
 } else {
 self["@resultCount"]=$recv(self["@resultCount"]).__plus((1));
@@ -3453,7 +3453,7 @@ $recv($recv(process)._stdin())._on_do_("keypress",(function(s,key){
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 return $core.withContext(function($ctx2) {
 //>>excludeEnd("ctx");
-if(($receiver = key) == null || $receiver.isNil){
+if(($receiver = key) == null || $receiver.a$nil){
 return key;
 } else {
 return self._onKeyPress_(key);
@@ -3517,7 +3517,7 @@ $1=$recv($2)._matchesOf_("\x5cd+$");
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["matchesOf:"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $recv($recv(aClass)._name()).__comma("2");
 } else {
 var counter;

src/Compiler-AST.js

@@ -317,7 +317,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._parent();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $1;
 } else {
 var node;
@@ -456,9 +456,9 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$receiver;
 $1=self["@position"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $2=self._parent();
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 return $2;
 } else {
 var node;
@@ -610,7 +610,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@shouldBeAliased"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return false;
 } else {
 return $1;
@@ -681,7 +681,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@source"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return "";
 } else {
 return $1;
@@ -958,7 +958,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@parameters"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@parameters"]=$recv($globals.Array)._new();
 return self["@parameters"];
 } else {
@@ -1280,7 +1280,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@arguments"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return [];
 } else {
 return $1;
@@ -1730,7 +1730,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@arguments"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@arguments"]=[];
 return self["@arguments"];
 } else {
@@ -1782,7 +1782,7 @@ $1=self._receiver();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["receiver"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $2=self._arguments();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["arguments"]=1;
@@ -2006,7 +2006,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@shouldBeInlined"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return false;
 } else {
 return $1;
@@ -2204,7 +2204,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@temps"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return [];
 } else {
 return $1;
@@ -2458,7 +2458,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@assigned"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return false;
 } else {
 return $1;

src/Compiler-Core.js

@@ -149,7 +149,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@source"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return "";
 } else {
 return $1;
@@ -330,7 +330,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$receiver;
 $1=self["@transformersDictionary"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $2=$recv($globals.Dictionary)._new();
 $recv($2)._at_put_("2000-semantic",self._semanticAnalyzer());
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
@@ -403,7 +403,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@codeGeneratorClass"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $globals.InliningCodeGenerator;
 } else {
 return $1;
@@ -831,7 +831,7 @@ return self._install_forClass_protocol_($recv(each)._source(),aClass,$recv(each)
 //>>excludeEnd("ctx");
 }),"Recompiling ".__comma($recv(aClass)._name()));
 $2=$recv(aClass)._theMetaClass();
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 $2;
 } else {
 var meta;
@@ -898,7 +898,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@source"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return "";
 } else {
 return $1;

src/Compiler-IR.js

@@ -181,7 +181,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@nextAlias"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@nextAlias"]=(0);
 self["@nextAlias"];
 } else {
@@ -1414,7 +1414,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._parent();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $1;
 } else {
 var node;
@@ -1656,7 +1656,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@arguments"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return [];
 } else {
 return $1;
@@ -1738,7 +1738,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@requiresSmalltalkContext"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return false;
 } else {
 return $1;
@@ -1982,7 +1982,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@internalVariables"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@internalVariables"]=$recv($globals.Set)._new();
 return self["@internalVariables"];
 } else {
@@ -2271,7 +2271,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@scope"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $recv(self._parent())._scope();
 } else {
 return $1;

src/Compiler-Inlining.js

@@ -23,7 +23,7 @@ $2=$recv($recv($globals.IRSendInliner)._inlinedSelectors())._includes_($recv(aNo
 if($core.assert($2)){
 $recv(aNode)._shouldBeInlined_(true);
 $3=$recv(aNode)._receiver();
-if(($receiver = $3) == null || $receiver.isNil){
+if(($receiver = $3) == null || $receiver.a$nil){
 $3;
 } else {
 var receiver;
@@ -940,7 +940,7 @@ self._visit_($5);
 $ctx2.sendIdx["visit:"]=1;
 //>>excludeEnd("ctx");
 $7=self._stream();
-$8=$recv(") == null || ".__comma(recvVarName)).__comma(".isNil");
+$8=$recv(") == null || ".__comma(recvVarName)).__comma(".a$nil");
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx2.sendIdx[","]=3;
 //>>excludeEnd("ctx");
@@ -980,7 +980,7 @@ return self;
 },
 //>>excludeStart("ide", pragmas.excludeIdeData);
 args: ["anIRInlinedIfNilIfNotNil"],
-source: "visitIRInlinedIfNilIfNotNil: anIRInlinedIfNilIfNotNil\x0a\x09self stream\x0a\x09\x09nextPutIf: [\x0a\x09\x09\x09| recvVarName |\x0a\x09\x09\x09recvVarName := anIRInlinedIfNilIfNotNil receiverInternalVariableName.\x0a\x09\x09\x09self stream nextPutAll: '(', recvVarName, ' = '.\x0a\x09\x09\x09self visit: anIRInlinedIfNilIfNotNil dagChildren first.\x0a\x09\x09\x09self stream nextPutAll: ') == null || ', recvVarName, '.isNil' ]\x0a\x09\x09then: [ self visit: anIRInlinedIfNilIfNotNil dagChildren second ]\x0a\x09\x09else: [ self visit: anIRInlinedIfNilIfNotNil dagChildren third ]",
+source: "visitIRInlinedIfNilIfNotNil: anIRInlinedIfNilIfNotNil\x0a\x09self stream\x0a\x09\x09nextPutIf: [\x0a\x09\x09\x09| recvVarName |\x0a\x09\x09\x09recvVarName := anIRInlinedIfNilIfNotNil receiverInternalVariableName.\x0a\x09\x09\x09self stream nextPutAll: '(', recvVarName, ' = '.\x0a\x09\x09\x09self visit: anIRInlinedIfNilIfNotNil dagChildren first.\x0a\x09\x09\x09self stream nextPutAll: ') == null || ', recvVarName, '.a$nil' ]\x0a\x09\x09then: [ self visit: anIRInlinedIfNilIfNotNil dagChildren second ]\x0a\x09\x09else: [ self visit: anIRInlinedIfNilIfNotNil dagChildren third ]",
 referencedClasses: [],
 //>>excludeEnd("ide");
 messageSends: ["nextPutIf:then:else:", "stream", "receiverInternalVariableName", "nextPutAll:", ",", "visit:", "first", "dagChildren", "second", "third"]
@@ -2196,7 +2196,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$receiver;
 $1=self["@transformersDictionary"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $2=(
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = true,
@@ -2257,7 +2257,7 @@ $2=$recv($recv($globals.IRSendInliner)._inlinedSelectors())._includes_($recv(aNo
 if($core.assert($2)){
 $recv(aNode)._shouldBeInlined_(true);
 $3=$recv(aNode)._receiver();
-if(($receiver = $3) == null || $receiver.isNil){
+if(($receiver = $3) == null || $receiver.a$nil){
 $3;
 } else {
 var receiver;

src/Compiler-Inlining.st

@@ -253,7 +253,7 @@ visitIRInlinedIfNilIfNotNil: anIRInlinedIfNilIfNotNil
 			recvVarName := anIRInlinedIfNilIfNotNil receiverInternalVariableName.
 			self stream nextPutAll: '(', recvVarName, ' = '.
 			self visit: anIRInlinedIfNilIfNotNil dagChildren first.
-			self stream nextPutAll: ') == null || ', recvVarName, '.isNil' ]
+			self stream nextPutAll: ') == null || ', recvVarName, '.a$nil' ]
 		then: [ self visit: anIRInlinedIfNilIfNotNil dagChildren second ]
 		else: [ self visit: anIRInlinedIfNilIfNotNil dagChildren third ]
 !

src/Compiler-Interpreter.js

@@ -385,7 +385,7 @@ var $1,$2,$3,$receiver;
 $1=self._isBlockContext();
 if($core.assert($1)){
 $2=self._outerContext();
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 return $2;
 } else {
 var context;
@@ -394,7 +394,7 @@ return $recv(context)._ast();
 }
 }
 $3=self["@ast"];
-if(($receiver = $3) == null || $receiver.isNil){
+if(($receiver = $3) == null || $receiver.a$nil){
 self._initializeAST();
 } else {
 $3;
@@ -607,7 +607,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@index"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return (0);
 } else {
 return $1;
@@ -694,13 +694,13 @@ $1=$recv(aMethodContext)._outerContext();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["outerContext"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 var outer;
 outer=$receiver;
 $2=$recv(outer)._methodContext();
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 $2;
 } else {
 self._outerContext_($recv(self._class())._fromMethodContext_($recv(aMethodContext)._outerContext()));
@@ -747,7 +747,7 @@ $1=$recv($globals.ASTInterpreter)._new();
 $recv($1)._context_(self);
 self["@interpreter"]=$recv($1)._yourself();
 $2=self._innerContext();
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 $2;
 } else {
 self._setupInterpreter_(self["@interpreter"]);
@@ -839,7 +839,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@interpreter"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self._initializeInterpreter();
 } else {
 $1;
@@ -999,7 +999,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@locals"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self._initializeLocals();
 } else {
 $1;
@@ -1149,7 +1149,7 @@ return $core.withContext(function($ctx1) {
 var $1,$receiver;
 self["@outerContext"]=anAIContext;
 $1=self["@outerContext"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 var context;
@@ -1268,7 +1268,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@sendIndexes"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $recv($globals.Dictionary)._new();
 } else {
 return $1;
@@ -1330,7 +1330,7 @@ $ctx1.sendIdx["ast"]=1;
 $recv($1)._visit_($3);
 currentNode=$recv($1)._currentNode();
 $4=$recv(self._ast())._sequenceNode();
-if(($receiver = $4) == null || $receiver.isNil){
+if(($receiver = $4) == null || $receiver.a$nil){
 $4;
 } else {
 var sequence;
@@ -1393,7 +1393,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@supercall"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return false;
 } else {
 return $1;
@@ -1632,7 +1632,7 @@ $1=self._context();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["context"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return true;
 } else {
 $1;
@@ -1707,7 +1707,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._context();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 var cxt;
@@ -1739,7 +1739,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._context();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $1;
 } else {
 var ctx;
@@ -1796,7 +1796,7 @@ $1=self._interpreter();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["interpreter"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $1;
 } else {
 return $recv(self._interpreter())._node();
@@ -1839,7 +1839,7 @@ $ctx1.sendIdx["atEnd"]=1;
 //>>excludeEnd("ctx");
 if($core.assert($2)){
 $4=$recv(self._context())._outerContext();
-if(($receiver = $4) == null || $receiver.isNil){
+if(($receiver = $4) == null || $receiver.a$nil){
 $4;
 } else {
 var outerContext;
@@ -2434,7 +2434,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@returned"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return false;
 } else {
 return $1;
@@ -2576,13 +2576,13 @@ return $core.withContext(function($ctx1) {
 var $1,$2,$receiver;
 nd=self._node();
 $1=$recv(nd)._parent();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 nextNode=$1;
 } else {
 var parent;
 parent=$receiver;
 $2=$recv(parent)._nextSiblingNode_(nd);
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 nextNode=parent;
 } else {
 var sibling;
@@ -2882,7 +2882,7 @@ $1=$recv($2)._superclass();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["superclass"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $3=self._messageNotUnderstood_receiver_(aMessage,anObject);
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["messageNotUnderstood:receiver:"]=1;
@@ -2985,7 +2985,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@stack"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@stack"]=$recv($globals.OrderedCollection)._new();
 return self["@stack"];
 } else {
@@ -3673,7 +3673,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@trackedIndex"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@trackedIndex"]=(0);
 return self["@trackedIndex"];
 } else {

src/Compiler-Semantic.js

@@ -132,7 +132,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@args"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@args"]=$recv($globals.Dictionary)._new();
 return self["@args"];
 } else {
@@ -222,7 +222,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@blockIndex"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return (0);
 } else {
 return $1;
@@ -418,12 +418,12 @@ return $core.withContext(function($ctx1) {
 var $1,$2,$receiver;
 lookup=self._bindingFor_(aNode);
 $1=lookup;
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $2=self._outerScope();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["outerScope"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 lookup=$2;
 } else {
 lookup=$recv(self._outerScope())._lookupVariable_(aNode);
@@ -460,7 +460,7 @@ $1=self._outerScope();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["outerScope"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $1;
 } else {
 return $recv(self._outerScope())._methodScope();
@@ -589,7 +589,7 @@ $1=self._outerScope();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["outerScope"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return (1);
 } else {
 $1;
@@ -631,7 +631,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@temps"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@temps"]=$recv($globals.Dictionary)._new();
 return self["@temps"];
 } else {
@@ -760,7 +760,7 @@ $ctx1.supercall = true,
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = false;
 //>>excludeEnd("ctx");;
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $recv(self._iVars())._at_ifAbsent_($recv(aNode)._value(),(function(){
 return nil;
 
@@ -856,7 +856,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@iVars"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@iVars"]=$recv($globals.Dictionary)._new();
 return self["@iVars"];
 } else {
@@ -904,7 +904,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@localReturn"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return false;
 } else {
 return $1;
@@ -970,7 +970,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@nonLocalReturns"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@nonLocalReturns"]=$recv($globals.OrderedCollection)._new();
 return self["@nonLocalReturns"];
 } else {
@@ -1000,7 +1000,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$4,$3,$receiver;
 $1=self["@pseudoVars"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@pseudoVars"]=$recv($globals.Dictionary)._new();
 self["@pseudoVars"];
 $recv($recv($globals.Smalltalk)._pseudoVariableNames())._do_((function(each){
@@ -1070,7 +1070,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@unknownVariables"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@unknownVariables"]=$recv($globals.OrderedCollection)._new();
 return self["@unknownVariables"];
 } else {
@@ -1732,7 +1732,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@classReferences"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@classReferences"]=$recv($globals.Set)._new();
 return self["@classReferences"];
 } else {
@@ -1837,7 +1837,7 @@ var self=this;
 return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$3,$receiver;
-if(($receiver = aPackage) == null || $receiver.isNil){
+if(($receiver = aPackage) == null || $receiver.a$nil){
 aPackage;
 } else {
 var packageKnownVars;
@@ -1878,7 +1878,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@messageSends"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@messageSends"]=$recv($globals.Dictionary)._new();
 return self["@messageSends"];
 } else {
@@ -1980,7 +1980,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@blockIndex"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@blockIndex"]=(0);
 self["@blockIndex"];
 } else {
@@ -2012,7 +2012,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@currentScope"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 self["@currentScope"]=$recv(self["@currentScope"])._outerScope();
@@ -2142,7 +2142,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=$recv(self["@currentScope"])._lookupVariable_(aString);
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 self._errorShadowingVariable_(aString);
@@ -2466,7 +2466,7 @@ return $core.withContext(function($ctx1) {
 var $1,$3,$2,$4,$5,$6,$7,$8,$9,$receiver;
 binding=$recv(self["@currentScope"])._lookupVariable_(aNode);
 $1=binding;
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $3=$recv(aNode)._value();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["value"]=1;

src/Compiler-Tests.js

@@ -533,7 +533,7 @@ return $recv(self["@receiver"])._perform_($recv(method)._selector());
 return $core.withContext(function($ctx2) {
 //>>excludeEnd("ctx");
 $3=method;
-if(($receiver = $3) == null || $receiver.isNil){
+if(($receiver = $3) == null || $receiver.a$nil){
 return $3;
 } else {
 return $recv($recv(anObject)._class())._removeCompiledMethod_(method);
@@ -1935,7 +1935,7 @@ $recv($1)._receiver_(anObject);
 $recv($1)._interpreter_(interpreter);
 ctx=$recv($1)._yourself();
 $2=$recv(ast)._sequenceNode();
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 $2;
 } else {
 var sequence;
@@ -2071,7 +2071,7 @@ $recv($1)._interpreter_($recv($globals.ASTInterpreter)._new());
 ctx=$recv($1)._yourself();
 ast=self._parse_forClass_(aString,$recv(anObject)._class());
 $2=$recv(ast)._sequenceNode();
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 $2;
 } else {
 var sequence;

src/Kernel-Announcements.js

@@ -97,7 +97,7 @@ $1=$recv($2)._at_($3);
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["at:"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return false;
 } else {
 var class_;
@@ -572,7 +572,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@current"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@current"]=(
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = true,
@@ -1029,7 +1029,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._theClass();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $1;
 } else {
 var class_;

src/Kernel-Classes.js

@@ -64,13 +64,13 @@ $recv($4)._addElement_($5);
 }
 self._basicAddCompiledMethod_(aMethod);
 $6=oldMethod;
-if(($receiver = $6) == null || $receiver.isNil){
+if(($receiver = $6) == null || $receiver.a$nil){
 $6;
 } else {
 self._removeProtocolIfEmpty_($recv(oldMethod)._protocol());
 }
 $7=oldMethod;
-if(($receiver = $7) == null || $receiver.isNil){
+if(($receiver = $7) == null || $receiver.a$nil){
 $8=$recv($globals.MethodAdded)._new();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["new"]=1;
@@ -200,7 +200,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._basicAt_("comment");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return "";
 } else {
 return $1;
@@ -686,7 +686,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._name();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 (
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = true,
@@ -1135,7 +1135,7 @@ $1=self._superclass();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["superclass"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $recv(result)._addAll_($recv(self._superclass())._allInstanceVariableNames());
@@ -1271,7 +1271,7 @@ $1=self._superclass();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["superclass"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return [];
 } else {
 $1;
@@ -1410,7 +1410,7 @@ $1=self._superclass();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["superclass"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return false;
 } else {
 $1;
@@ -1820,7 +1820,7 @@ $1=self._package();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["package"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return "Unclassified";
 } else {
 return $recv(self._package())._name();
@@ -2775,7 +2775,7 @@ $1=self._package();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["package"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return "Unclassified";
 } else {
 return $recv(self._package())._name();
@@ -3068,7 +3068,7 @@ var $1,$2,$3,$receiver;
 theClass=$recv($recv($globals.Smalltalk)._globals())._at_(className);
 thePackage=$recv($globals.Package)._named_(packageName);
 $1=theClass;
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $recv(theClass)._package_(thePackage);
@@ -3107,7 +3107,7 @@ var $1,$2,$receiver;
 theTrait=$recv($recv($globals.Smalltalk)._globals())._at_(traitName);
 thePackage=$recv($globals.Package)._named_(packageName);
 $1=theTrait;
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $2=theTrait;
@@ -3767,7 +3767,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$3,$5,$4,$receiver;
 $1=self._instanceVariableNamesFor_(ivarNames);
-if(($receiver = packageName) == null || $receiver.isNil){
+if(($receiver = packageName) == null || $receiver.a$nil){
 $2="unclassified";
 } else {
 $2=packageName;

src/Kernel-Collections.js

@@ -8058,7 +8058,7 @@ return $core.withContext(function($ctx1) {
 var $1,$receiver;
 bucket=self._bucketsOfElement_(anObject);
 $1=$recv(bucket)._second();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 var object,slowBucket;
 object=$recv(bucket)._first();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
@@ -8137,7 +8137,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 
 		// include nil to well-known objects under "boolean" fastBucket
-		if (anObject == null || anObject.isNil) return [ null, self['@fastBuckets'].boolean ];
+		if (anObject == null || anObject.a$nil) return [ null, self['@fastBuckets'].boolean ];
 		
 		var prim = anObject.valueOf();
 		if (typeof prim === "object" || typeof prim === "function" || !self['@fastBuckets'][typeof prim]) {
@@ -8156,7 +8156,7 @@ return self;
 },
 //>>excludeStart("ide", pragmas.excludeIdeData);
 args: ["anObject"],
-source: "bucketsOfElement: anObject\x0a\x09\x22Find the appropriate bucket for `anObject`.\x0a\x09For optimization purposes, directly answer an array with: \x0a\x09- the object to be store\x0a\x09- the primitive bucket\x0a\x09- the slow bucket\x22\x0a\x09\x0a\x09<inlineJS: '\x0a\x09\x09// include nil to well-known objects under \x22boolean\x22 fastBucket\x0a\x09\x09if (anObject == null || anObject.isNil) return [ null, self[''@fastBuckets''].boolean ];\x0a\x09\x09\x0a\x09\x09var prim = anObject.valueOf();\x0a\x09\x09if (typeof prim === \x22object\x22 || typeof prim === \x22function\x22 || !self[''@fastBuckets''][typeof prim]) {\x0a\x09\x09\x09var bucket = null;\x0a\x09\x09\x09self[''@slowBucketStores''].some(function (store) {\x0a\x09\x09\x09\x09return bucket = store._bucketOfElement_(anObject);\x0a\x09\x09\x09});\x0a\x09\x09\x09return [ anObject, null, bucket || self[''@defaultBucket''] ];\x0a\x09\x09}\x0a\x09\x09return [ prim, self[''@fastBuckets''][typeof prim] ];\x0a\x09'>",
+source: "bucketsOfElement: anObject\x0a\x09\x22Find the appropriate bucket for `anObject`.\x0a\x09For optimization purposes, directly answer an array with: \x0a\x09- the object to be store\x0a\x09- the primitive bucket\x0a\x09- the slow bucket\x22\x0a\x09\x0a\x09<inlineJS: '\x0a\x09\x09// include nil to well-known objects under \x22boolean\x22 fastBucket\x0a\x09\x09if (anObject == null || anObject.a$nil) return [ null, self[''@fastBuckets''].boolean ];\x0a\x09\x09\x0a\x09\x09var prim = anObject.valueOf();\x0a\x09\x09if (typeof prim === \x22object\x22 || typeof prim === \x22function\x22 || !self[''@fastBuckets''][typeof prim]) {\x0a\x09\x09\x09var bucket = null;\x0a\x09\x09\x09self[''@slowBucketStores''].some(function (store) {\x0a\x09\x09\x09\x09return bucket = store._bucketOfElement_(anObject);\x0a\x09\x09\x09});\x0a\x09\x09\x09return [ anObject, null, bucket || self[''@defaultBucket''] ];\x0a\x09\x09}\x0a\x09\x09return [ prim, self[''@fastBuckets''][typeof prim] ];\x0a\x09'>",
 referencedClasses: [],
 //>>excludeEnd("ide");
 messageSends: []
@@ -8310,7 +8310,7 @@ return $core.withContext(function($ctx1) {
 var $1,$2,$3,$receiver;
 bucket=self._bucketsOfElement_(anObject);
 $1=$recv(bucket)._second();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $2=$recv(bucket)._third();
 $3=$recv(bucket)._first();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
@@ -8536,7 +8536,7 @@ var $early={};
 try {
 bucket=self._bucketsOfElement_(anObject);
 $1=$recv(bucket)._second();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $2=$recv(bucket)._third();
 $3=$recv(bucket)._first();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
@@ -9485,7 +9485,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@position"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@position"]=(0);
 return self["@position"];
 } else {

src/Kernel-Collections.st

@@ -2056,7 +2056,7 @@ bucketsOfElement: anObject
 	
 	<inlineJS: '
 		// include nil to well-known objects under "boolean" fastBucket
-		if (anObject == null || anObject.isNil) return [ null, self[''@fastBuckets''].boolean ];
+		if (anObject == null || anObject.a$nil) return [ null, self[''@fastBuckets''].boolean ];
 		
 		var prim = anObject.valueOf();
 		if (typeof prim === "object" || typeof prim === "function" || !!self[''@fastBuckets''][typeof prim]) {

src/Kernel-Dag.js

@@ -535,7 +535,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@nodes"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@nodes"]=$recv($globals.Array)._new();
 return self["@nodes"];
 } else {

src/Kernel-Infrastructure.js

@@ -200,7 +200,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=$recv($globals.JSObjectProxy)._lookupProperty_ofProxy_($recv($recv(aMessage)._selector())._asJavaScriptPropertyName(),self);
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return (
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = true,
@@ -1007,7 +1007,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@imports"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 var parsed;
 parsed=self._importsFromJson_(self._basicImports());
 parsed;
@@ -1203,7 +1203,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@dirty"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return false;
 } else {
 return $1;
@@ -1318,7 +1318,7 @@ $5=$recv(each)._protocols();
 $ctx2.sendIdx["protocols"]=1;
 //>>excludeEnd("ctx");
 $7=$recv(each)._theMetaClass();
-if(($receiver = $7) == null || $receiver.isNil){
+if(($receiver = $7) == null || $receiver.a$nil){
 $6=[];
 } else {
 var meta;
@@ -1636,7 +1636,7 @@ $recv($1)._at_put_(each,$2);
 $ctx2.sendIdx["at:put:"]=1;
 //>>excludeEnd("ctx");
 $3=$recv(each)._theMetaClass();
-if(($receiver = $3) == null || $receiver.isNil){
+if(($receiver = $3) == null || $receiver.a$nil){
 return $3;
 } else {
 var meta;
@@ -1680,7 +1680,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$receiver;
 $1=self["@transport"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $2=$recv($globals.PackageTransport)._fromJson_(self._basicTransport());
 $recv($2)._package_(self);
 self["@transport"]=$recv($2)._yourself();
@@ -2059,7 +2059,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=$recv(anAnnouncement)._theClass();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 var theClass;
@@ -2091,7 +2091,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=$recv($recv(anAnnouncement)._method())._package();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 var package_;
@@ -2147,7 +2147,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=$recv(anAnnouncement)._package();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 var package_;
@@ -2181,7 +2181,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@current"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@current"]=self._new();
 return self["@current"];
 } else {
@@ -3319,7 +3319,7 @@ $ctx2.sendIdx["error:"]=1;
 //>>excludeEnd("ctx");
 }));
 $2=self._packageAt_(newName);
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 $2;
 } else {
 self._error_("Already exists a package called: ".__comma(newName));
@@ -3414,7 +3414,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@current"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@current"]=(
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.supercall = true,

src/Kernel-Methods.js

@@ -914,7 +914,7 @@ superclass=$recv($1)._superclass();
 $ctx1.sendIdx["superclass"]=1;
 //>>excludeEnd("ctx");
 $2=superclass;
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 return false;
 } else {
 $2;
@@ -990,7 +990,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._methodClass();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $1;
 } else {
 var class_;
@@ -1021,7 +1021,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._basicAt_("protocol");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return self._defaultProtocol();
 } else {
 return $1;
@@ -1059,7 +1059,7 @@ $recv($3)._oldProtocol_(oldProtocol);
 $2=$recv($3)._yourself();
 $recv($1)._announce_($2);
 $4=self._methodClass();
-if(($receiver = $4) == null || $receiver.isNil){
+if(($receiver = $4) == null || $receiver.a$nil){
 $4;
 } else {
 var methodClass;
@@ -1185,7 +1185,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._basicAt_("source");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return "";
 } else {
 return $1;
@@ -1416,7 +1416,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@maxPoolSize"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return self._defaultMaxPoolSize();
 } else {
 return $1;
@@ -1466,7 +1466,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@default"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self["@default"]=self._new();
 return self["@default"];
 } else {
@@ -2342,7 +2342,7 @@ $1=self._methodContext();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["methodContext"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return nil;
 } else {
 $1;
@@ -2367,7 +2367,7 @@ method=$recv($4)._lookupSelector_($5);
 $ctx1.sendIdx["lookupSelector:"]=1;
 //>>excludeEnd("ctx");
 $7=self._outerContext();
-if(($receiver = $7) == null || $receiver.isNil){
+if(($receiver = $7) == null || $receiver.a$nil){
 supercall=false;
 } else {
 var outer;
@@ -2408,7 +2408,7 @@ if(!$core.assert($1)){
 return self;
 }
 $2=self._outerContext();
-if(($receiver = $2) == null || $receiver.isNil){
+if(($receiver = $2) == null || $receiver.a$nil){
 return $2;
 } else {
 var outer;

src/Kernel-Tests.js

@@ -1932,7 +1932,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@theClass"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $recv($globals.Smalltalk)._removeClass_(self["@theClass"]);
@@ -2305,7 +2305,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@theClass"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $recv($recv(self["@theClass"])._allSubclasses())._reverseDo_((function(each){
@@ -13962,7 +13962,7 @@ $5=$recv($globals.Object)._new();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["new"]=2;
 //>>excludeEnd("ctx");
-if(($receiver = $5) == null || $receiver.isNil){
+if(($receiver = $5) == null || $receiver.a$nil){
 $4=true;
 } else {
 $4=$5;
@@ -13973,7 +13973,7 @@ $7=$recv($globals.Object)._new();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["new"]=3;
 //>>excludeEnd("ctx");
-if(($receiver = $7) == null || $receiver.isNil){
+if(($receiver = $7) == null || $receiver.a$nil){
 $6=$7;
 } else {
 $6=true;
@@ -13986,7 +13986,7 @@ $9=$recv($globals.Object)._new();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["new"]=4;
 //>>excludeEnd("ctx");
-if(($receiver = $9) == null || $receiver.isNil){
+if(($receiver = $9) == null || $receiver.a$nil){
 $8=false;
 } else {
 $8=true;
@@ -13996,7 +13996,7 @@ self._assert_equals_($8,true);
 $ctx1.sendIdx["assert:equals:"]=2;
 //>>excludeEnd("ctx");
 $11=$recv($globals.Object)._new();
-if(($receiver = $11) == null || $receiver.isNil){
+if(($receiver = $11) == null || $receiver.a$nil){
 $10=false;
 } else {
 $10=true;
@@ -15486,7 +15486,7 @@ var self=this;
 return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$3,$2,$4,$6,$5,$receiver;
-if(($receiver = nil) == null || $receiver.isNil){
+if(($receiver = nil) == null || $receiver.a$nil){
 $1=true;
 } else {
 $1=nil;
@@ -15495,7 +15495,7 @@ self._assert_equals_($1,true);
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["assert:equals:"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = nil) == null || $receiver.isNil){
+if(($receiver = nil) == null || $receiver.a$nil){
 $3=nil;
 } else {
 $3=true;
@@ -15508,13 +15508,13 @@ self._deny_($2);
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["deny:"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = nil) == null || $receiver.isNil){
+if(($receiver = nil) == null || $receiver.a$nil){
 $4=true;
 } else {
 $4=false;
 }
 self._assert_equals_($4,true);
-if(($receiver = nil) == null || $receiver.isNil){
+if(($receiver = nil) == null || $receiver.a$nil){
 $6=false;
 } else {
 $6=true;

src/Platform-Browser.js

@@ -38,7 +38,7 @@ var self=this;
 return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $receiver;
-if(($receiver = $globals.XMLHttpRequest) == null || $receiver.isNil){
+if(($receiver = $globals.XMLHttpRequest) == null || $receiver.a$nil){
 self._error_("XMLHttpRequest not available.");
 } else {
 return $recv($globals.NativeFunction)._constructorOf_($globals.XMLHttpRequest);

src/Platform-ImportExport.js

@@ -464,7 +464,7 @@ self._exportBehavior_on_(each,aStream);
 $ctx2.sendIdx["exportBehavior:on:"]=1;
 //>>excludeEnd("ctx");
 $1=$recv(each)._theMetaClass();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $1;
 } else {
 var meta;
@@ -1107,7 +1107,7 @@ $3=$recv($recv(aClass)._name())._asJavaScriptSource();
 $ctx1.sendIdx["asJavaScriptSource"]=1;
 //>>excludeEnd("ctx");
 $5=$recv(aClass)._superclass();
-if(($receiver = $5) == null || $receiver.isNil){
+if(($receiver = $5) == null || $receiver.a$nil){
 $4="null";
 } else {
 var superclass;
@@ -1411,7 +1411,7 @@ self._exportBehavior_on_(each,aStream);
 $ctx2.sendIdx["exportBehavior:on:"]=1;
 //>>excludeEnd("ctx");
 $1=$recv(each)._theMetaClass();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return $1;
 } else {
 var meta;
@@ -3386,7 +3386,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$3,$2,$receiver;
 $1=$recv($globals.Smalltalk)._amdRequire();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self._error_("AMD loader not present");
 } else {
 var require;
@@ -3446,7 +3446,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=$recv($globals.Smalltalk)._amdRequire();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return self._error_("AMD loader not present");
 } else {
 var require;
@@ -3838,7 +3838,7 @@ var self=this;
 return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$receiver;
-if(($receiver = anObject) == null || $receiver.isNil){
+if(($receiver = anObject) == null || $receiver.a$nil){
 $1=self._for_(self._defaultType());
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["for:"]=1;
@@ -3940,7 +3940,7 @@ $1=$recv(aClass)._type();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["type"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $recv(self["@registry"])._at_put_($recv(aClass)._type(),aClass);
@@ -4099,7 +4099,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@namespace"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return self._defaultNamespace();
 } else {
 return $1;

src/Platform-Node.js

@@ -38,7 +38,7 @@ var self=this;
 return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $receiver;
-if(($receiver = $globals.XMLHttpRequest) == null || $receiver.isNil){
+if(($receiver = $globals.XMLHttpRequest) == null || $receiver.a$nil){
 self._error_("XMLHttpRequest not available.");
 } else {
 return $recv($globals.XMLHttpRequest)._new();

src/Platform-Services.js

@@ -24,7 +24,7 @@ $1=$recv(anError)._context();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["context"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 self._logErrorContext_($recv(anError)._context());
@@ -82,7 +82,7 @@ $1=$recv(aContext)._home();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["home"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 self._logContext_($recv(aContext)._home());
@@ -136,14 +136,14 @@ var self=this;
 return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
-if(($receiver = aContext) == null || $receiver.isNil){
+if(($receiver = aContext) == null || $receiver.a$nil){
 aContext;
 } else {
 $1=$recv(aContext)._home();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["home"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 self._logContext_($recv(aContext)._home());
@@ -437,7 +437,7 @@ $1=$recv(aClass)._superclass();
 //>>excludeStart("ctx", pragmas.excludeDebugContexts);
 $ctx1.sendIdx["superclass"]=1;
 //>>excludeEnd("ctx");
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $recv(protocols)._addAll_(self._availableProtocolsFor_($recv(aClass)._superclass()));
@@ -490,7 +490,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=$recv($recv($globals.Smalltalk)._globals())._at_($recv(aString)._asSymbol());
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 return self._error_("Invalid class name");
 } else {
 return $1;
@@ -653,7 +653,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$receiver;
 $1=$recv($recv($globals.Smalltalk)._globals())._at_(aClassName);
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $2=$recv("A class named ".__comma(aClassName)).__comma(" already exists");
@@ -798,7 +798,7 @@ return $core.withContext(function($ctx1) {
 var $1,$2,$receiver;
 package_=$recv($globals.Package)._named_(aPackageName);
 $1=package_;
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self._error_("Invalid package name");
 } else {
 $1;
@@ -1128,7 +1128,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$receiver;
 $1=$recv($recv($globals.Smalltalk)._globals())._at_(aClassName);
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $2=$recv("A class named ".__comma(aClassName)).__comma(" already exists");
@@ -1163,7 +1163,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$2,$receiver;
 $1=$recv($recv($globals.Smalltalk)._globals())._at_(aNewPackageName);
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $2=$recv("A package named ".__comma(aNewPackageName)).__comma(" already exists");
@@ -1401,7 +1401,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self._current();
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 self._register_(anObject);
 } else {
 $1;

src/SUnit.js

@@ -554,7 +554,7 @@ return $core.withContext(function($ctx1) {
 //>>excludeEnd("ctx");
 var $1,$receiver;
 $1=self["@asyncTimeout"];
-if(($receiver = $1) == null || $receiver.isNil){
+if(($receiver = $1) == null || $receiver.a$nil){
 $1;
 } else {
 $recv(self["@asyncTimeout"])._clearTimeout();

support/kernel-language.js

@@ -196,7 +196,7 @@ define(['./compatibility'], function () {
 
         function classBuilder (className, superclass, iVarNames, fn) {
             var logicalSuperclass = superclass;
-            if (superclass == null || superclass.isNil) {
+            if (superclass == null || superclass.a$nil) {
                 superclass = nilAsClass;
                 logicalSuperclass = null;
             }
@@ -259,7 +259,7 @@ define(['./compatibility'], function () {
         st.addClass = function (className, superclass, iVarNames, pkgName) {
             // While subclassing nil is allowed, it might be an error, so
             // warn about it.
-            if (typeof superclass == 'undefined' || superclass && superclass.isNil) {
+            if (typeof superclass == 'undefined' || superclass && superclass.a$nil) {
                 console.warn('Compiling ' + className + ' as a subclass of `nil`. A dependency might be missing.');
             }
             return buildBehaviorBody(pkgName, classBuilder(className, superclass, iVarNames, coreFns[className]));
@@ -314,11 +314,15 @@ define(['./compatibility'], function () {
 
         this.nilAsReceiver = new SmalltalkNil();
 
-        // Adds an `isNil` property to the `nil` object.  When sending
+        // Adds an `a$nil` (and legacy `isNil`) property to the `nil` object.  When sending
         // nil objects from one environment to another, doing
         // `anObject == nil` (in JavaScript) does not always answer
         // true as the referenced nil object might come from the other
         // environment.
+        Object.defineProperty(this.nilAsReceiver, 'a$nil', {
+            value: true,
+            enumerable: false, configurable: false, writable: false
+        });
         Object.defineProperty(this.nilAsReceiver, 'isNil', {
             value: true,
             enumerable: false, configurable: false, writable: false