Fix code hover/select for anon. inner override of varargs method

[eric-milles]

interface LibarayFunction {
  String compute(String... args)
}

def stringFunction = new LibarayFunction() {
  @Override
  String compute(String... args) { // Code Select error here!
  }
}

Java Model Exception: Java Model Status [compute(java.lang.String[]) [in Transient$1 [in Transient [in [Working copy] Transient.groovy [in <default> [in src/main [in Groovy]]]]]] does not exist]
	at org.eclipse.jdt.internal.core.JavaElement.newNotPresentException(JavaElement.java:562)
	at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:603)
	at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:319)
	at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:305)
	at org.eclipse.jdt.internal.core.SourceRefElement.getSourceRange(SourceRefElement.java:218)
	at org.codehaus.groovy.eclipse.codebrowsing.requestor.CodeSelectRequestor.interestingElement(CodeSelectRequestor.java:154)
	at org.codehaus.groovy.eclipse.codebrowsing.requestor.CodeSelectRequestor.acceptASTNode(CodeSelectRequestor.java:118)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.handleRequestor(TypeInferencingVisitorWithRequestor.java:1963)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.handleSimpleExpression(TypeInferencingVisitorWithRequestor.java:1952)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitConstantExpression(TypeInferencingVisitorWithRequestor.java:1127)
	at org.codehaus.groovy.ast.expr.ConstantExpression.visit(ConstantExpression.java:85)
	at org.codehaus.groovy.ast.CodeVisitorSupport.visitReturnStatement(CodeVisitorSupport.java:78)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitReturnStatement(ClassCodeVisitorSupport.java:295)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitReturnStatement(TypeInferencingVisitorWithRequestor.java:1667)
	at org.codehaus.groovy.ast.stmt.ReturnStatement.visit(ReturnStatement.java:49)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:147)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:158)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitConstructorOrMethod(TypeInferencingVisitorWithRequestor.java:1212)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitMethodInternal(TypeInferencingVisitorWithRequestor.java:761)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitConstructorCallExpression(TypeInferencingVisitorWithRequestor.java:1172)
	at org.codehaus.groovy.ast.expr.ConstructorCallExpression.visit(ConstructorCallExpression.java:46)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitBinaryExpression(TypeInferencingVisitorWithRequestor.java:912)
	at org.codehaus.groovy.ast.CodeVisitorSupport.visitDeclarationExpression(CodeVisitorSupport.java:250)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitDeclarationExpression(ClassCodeVisitorSupport.java:153)
	at org.codehaus.groovy.ast.expr.DeclarationExpression.visit(DeclarationExpression.java:89)
	at org.codehaus.groovy.ast.CodeVisitorSupport.visitReturnStatement(CodeVisitorSupport.java:78)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitReturnStatement(ClassCodeVisitorSupport.java:295)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitReturnStatement(TypeInferencingVisitorWithRequestor.java:1667)
	at org.codehaus.groovy.ast.stmt.ReturnStatement.visit(ReturnStatement.java:49)
	at org.codehaus.groovy.ast.CodeVisitorSupport.visitBlockStatement(CodeVisitorSupport.java:40)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitBlockStatement(ClassCodeVisitorSupport.java:250)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitBlockStatement(TypeInferencingVisitorWithRequestor.java:984)
	at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:71)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:147)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:158)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitConstructorOrMethod(TypeInferencingVisitorWithRequestor.java:1212)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitJDT(TypeInferencingVisitorWithRequestor.java:519)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitJDT(TypeInferencingVisitorWithRequestor.java:390)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitCompilationUnit(TypeInferencingVisitorWithRequestor.java:354)
	at org.codehaus.groovy.eclipse.codebrowsing.requestor.CodeSelectHelper.select(CodeSelectHelper.java:84)
	at org.codehaus.jdt.groovy.model.GroovyCompilationUnit.codeSelect(GroovyCompilationUnit.java:509)
	at org.codehaus.jdt.groovy.model.GroovyCompilationUnit.codeSelect(GroovyCompilationUnit.java:502)
	at org.codehaus.jdt.groovy.model.GroovyCompilationUnit.codeSelect(GroovyCompilationUnit.java:496)
	at org.eclipse.jdt.internal.ui.text.java.hover.AbstractJavaEditorTextHover.getJavaElementsAt(AbstractJavaEditorTextHover.java:121)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavaSourceHover.getHoverInfo(JavaSourceHover.java:131)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavaSourceHover.getHoverInfo2(JavaSourceHover.java:118)
	at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo2(BestMatchHover.java:164)
	at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo2(BestMatchHover.java:130)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavaEditorTextHoverProxy.getHoverInfo2(JavaEditorTextHoverProxy.java:86)
	at org.eclipse.jface.text.TextViewerHoverManager$4.run(TextViewerHoverManager.java:166)