Description Knut Wannheden 2011-04-18 02:41:15 EDT

The following Xtend snippet

	<T extends Integer> (T,T)=>T genericCastOfFunctionResult() {
		[T a,T b|(a+(b as Integer)) as T]
	}

is accepted by the Xtend2 editor (i.e. passes validation) but the compiler chokes on it with the following error (displayed in the console):

1557562 [Worker-15] ERROR org.eclipse.xtext.xtend2.ui.builder.Xtend2BuilderParticipant  - Error compiling platform:/resource/test/src/Test.xtend
java.lang.IllegalArgumentException: argument may not be null if parameters have to be replaced by wildcards
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.serialize(AbstractXbaseCompiler.java:190)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.serialize(AbstractXbaseCompiler.java:146)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.serialize(AbstractXbaseCompiler.java:143)
	at org.eclipse.xtext.xbase.compiler.TypeConvertingCompiler.convertPrimitiveToWrapper(TypeConvertingCompiler.java:185)
	at org.eclipse.xtext.xbase.compiler.TypeConvertingCompiler.doConversion(TypeConvertingCompiler.java:77)
	at org.eclipse.xtext.xbase.compiler.TypeConvertingCompiler.internalToConvertedExpression(TypeConvertingCompiler.java:58)
	at org.eclipse.xtext.xbase.compiler.XbaseCompiler._toJavaExpression(XbaseCompiler.java:310)
	at sun.reflect.GeneratedMethodAccessor235.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaExpression(AbstractXbaseCompiler.java:121)
	at org.eclipse.xtext.xbase.compiler.TypeConvertingCompiler.internalToConvertedExpression(TypeConvertingCompiler.java:71)
	at org.eclipse.xtext.xbase.compiler.TypeConvertingCompiler.internalToJavaExpression(TypeConvertingCompiler.java:50)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.compile(AbstractXbaseCompiler.java:97)
	at org.eclipse.xtext.xbase.compiler.XbaseCompiler._toJavaStatement(XbaseCompiler.java:504)
	at org.eclipse.xtext.xtend2.compiler.Xtend2Compiler._toJavaStatement(Xtend2Compiler.java:455)
	at sun.reflect.GeneratedMethodAccessor229.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:109)
	at org.eclipse.xtext.xbase.compiler.XbaseCompiler._toJavaStatement(XbaseCompiler.java:52)
	at sun.reflect.GeneratedMethodAccessor222.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:109)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.compile(AbstractXbaseCompiler.java:91)
	at org.eclipse.xtext.xtend2.compiler.Xtend2Compiler.compile(Xtend2Compiler.java:292)
	at org.eclipse.xtext.xtend2.compiler.Xtend2Compiler.compile(Xtend2Compiler.java:152)
	at org.eclipse.xtext.xtend2.compiler.Xtend2Compiler.compile(Xtend2Compiler.java:106)
	at org.eclipse.xtext.xtend2.ui.builder.Xtend2BuilderParticipant.compile(Xtend2BuilderParticipant.java:142)
	at org.eclipse.xtext.xtend2.ui.builder.Xtend2BuilderParticipant.processDelta(Xtend2BuilderParticipant.java:111)
	at org.eclipse.xtext.xtend2.ui.builder.Xtend2BuilderParticipant.build(Xtend2BuilderParticipant.java:75)
	at org.eclipse.xtext.builder.impl.RegistryBuilderParticipant.build(RegistryBuilderParticipant.java:60)
	at org.eclipse.xtext.builder.impl.XtextBuilder.doBuild(XtextBuilder.java:160)
	at org.eclipse.xtext.builder.impl.XtextBuilder.incrementalBuild(XtextBuilder.java:141)
	at org.eclipse.xtext.builder.impl.XtextBuilder.build(XtextBuilder.java:91)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:627)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)