[jira] [Created] (GROOVY-9079) STC: NPE in StaticTypeCheckingVisitor.inferSAMTypeGenericsInAssignment

["Eric Milles (JIRA)" <ji...@apache.org>]

Eric Milles created GROOVY-9079:
-----------------------------------

             Summary: STC: NPE in StaticTypeCheckingVisitor.inferSAMTypeGenericsInAssignment
                 Key: GROOVY-9079
                 URL: https://issues.apache.org/jira/browse/GROOVY-9079
             Project: Groovy
          Issue Type: Bug
            Reporter: Eric Milles


Consider the following:
{code:groovy}
@groovy.transform.CompileStatic
void meth() {
  java.util.concurrent.Callable<String> call = { -> }
}
{code}

This code produces:
{code}
BUG! exception in phase 'instruction selection' in source unit 'Blah.groovy' unexpected NullpointerException
	at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1148)
	at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:654)
	at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:632)
	at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:609)
	...
Caused by: java.lang.NullPointerException
	at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.inferSAMTypeGenericsInAssignment(StaticTypeCheckingVisitor.java:4282)
	at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.getResultType(StaticTypeCheckingVisitor.java:4133)
	at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitBinaryExpression(StaticTypeCheckingVisitor.java:831)
	...
{code}


The method in StaticTypeCheckingVisitor calls ClosureExpression.getParameters(), which returns null for a closure expression like "{ -> }".



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