javac bug: java.lang.AssertionError: unexpected type: <nulltype>

[maurizio cimadamore]

On 10/11/2010 03:21, Mark Mahieu wrote:
> Hi,
>
> Couldn't see any mention of this yet - compiling the following class triggers an AssertionError in javac.  I'm using the latest code from hg (lambda/lambda/langtools).
Hi Mark
Thanks for the report. I'm working on a fix.

Maurizio
>   	class Bang {
> 		
> 		interface Foo<T>  {
> 			T foo(T a, T b);
> 		}
>
> 		Foo<? extends String>  f = #{ a, b ->  a };
> 	}
>
>
> 	java.lang.AssertionError: unexpected type:<nulltype>
> 	at com.sun.tools.javac.tree.TreeMaker.Type(TreeMaker.java:711)
> 	        at com.sun.tools.javac.comp.Attr$2.inst(Attr.java:2225)
> 	        at com.sun.tools.javac.comp.Infer.instantiateExpr(Infer.java:333)
> 	        at com.sun.tools.javac.comp.Check.instantiatePoly(Check.java:453)
> 	        at com.sun.tools.javac.comp.Check.checkType(Check.java:412)
> 	        at com.sun.tools.javac.comp.Check.checkType(Check.java:405)
> 	        at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2142)
> 	        at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1497)
> 	        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:457)
> 	        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:475)
> 	        at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:479)
> 	        at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:877)
> 	        at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:745)
> 	        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:457)
> 	        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:475)
> 	        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:510)
> 	        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:3719)
> 	        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:3642)
> 	        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:3578)
> 	        at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1153)
> 	        at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:843)
> 	        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:802)
> 	        at com.sun.tools.javac.main.Main.compile(Main.java:418)
> 	        at com.sun.tools.javac.main.Main.compile(Main.java:336)
> 	        at com.sun.tools.javac.main.Main.compile(Main.java:327)
> 	        at com.sun.tools.javac.Main.compile(Main.java:82)
> 	        at com.sun.tools.javac.Main.main(Main.java:67)
>
>
> Cheers,
>
> Mark
>
>