Bug 82940 [quick fix] Missing sensible conversion suggestion
For this code > % cat Test.java import java.util.Collections; import java.util.List; public class Test { interface Wrapper { int doit(); } private static final List<Wrapper> STD_WRAPPERS = Collections.singletonList ((Wrapper)new Wrapper() { public int doit() { return 0; } }); private static final List<Wrapper> STD_WRAPPERS2 = Collections.singletonList (new Wrapper() { public int doit() { return 0; } }); } The value passed Collections.singletonList is actually of the right type so a sensible conversion would be to put in the cast (see the difference between the 2 statics). The current quick fixes offered assume the type being assigned to is wrong (when infact it is right). A useful quick fix would be to cast the parameter to the right type to give the left type (this would help with any 1 arg method of the form X<T> method(T)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/correction/UnresolvedElementsSubProcessor.java
if (node.isSimpleName()) {
					enclosingPackage= (IPackageFragment) cu.getParent();
					
				} else {
					Name qualifierName= ((QualifiedName) node).getQualifier();
					 IBinding binding= qualifierName.resolveBinding();
					 if (binding instanceof ITypeBinding) {
						enclosingType=(IType) binding.getJavaElement();
					 } else if (binding instanceof IPackageBinding) {
						qualifier= qualifierName;
					 	enclosingPackage= (IPackageFragment) binding.getJavaElement();
					 } else {
					 	IJavaElement[] res= cu.codeSelect(qualifierName.getStartPosition(), qualifierName.getLength());
						if (res!= null && res.length > 0 && res[0] instanceof IType) {
							enclosingType= (IType) res[0];
						} else {
							qualifier= qualifierName;
							enclosingPackage= JavaModelUtil.getPackageFragmentRoot(cu).getPackageFragment(ASTResolving.getFullName(qualifierName));
						}
					 }
				}
				int rel= relevance;
				if (enclosingPackage != null && isLikelyPackageName(enclosingPackage.getElementName())) {
					rel += 3;
				}
				if ((enclosingPackage != null && !enclosingPackage.getCompilationUnit(typeName + ".java").exists()) 
						|| (enclosingType != null && !enclosingType.isReadOnly() && !enclosingType.getType(typeName).exists())) { 
					IJavaElement enclosing= enclosingPackage != null ? (IJavaElement) enclosingPackage : enclosingType;
					if ((kind & SimilarElementsRequestor.CLASSES) != 0) {
			            proposals.add(new NewCUCompletionUsingWizardProposal(cu, node, NewCUCompletionUsingWizardProposal.K_CLASS, enclosing, rel+2));