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
senderDeclBinding= declaringTypeBinding;
			targetCU= cu;
		}
		if (!senderDeclBinding.isFromSource() || targetCU == null || !JavaModelUtil.isEditable(targetCU)) {
			return;
		}
		addNewFieldForType(targetCU, binding, senderDeclBinding, simpleName, isWriteAccess, proposals);
		if (binding == null && senderDeclBinding.isNested()) {
			ASTNode anonymDecl= astRoot.findDeclaringNode(senderDeclBinding);
			if (anonymDecl != null) {
				ITypeBinding bind= Bindings.getBindingOfParentType(anonymDecl.getParent());
				if (!bind.isAnonymous()) {
					addNewFieldForType(targetCU, bind, bind, simpleName, isWriteAccess, proposals);
				}
			}
		}
	}
	private static void addNewFieldForType(ICompilationUnit targetCU, ITypeBinding binding, ITypeBinding senderDeclBinding, SimpleName simpleName, boolean isWriteAccess, Collection proposals) {
		String name= simpleName.getIdentifier();
		String label;
		Image image;
		if (senderDeclBinding.isEnum() && !isWriteAccess) {
			label= Messages.format(CorrectionMessages.UnresolvedElementsSubProcessor_createenum_description, new Object[] { name, ASTResolving.getTypeSignature(senderDeclBinding) });
			image= JavaPluginImages.get(JavaPluginImages.IMG_FIELD_PUBLIC);
			proposals.add(new NewVariableCompletionProposal(label, targetCU, NewVariableCompletionProposal.ENUM_CONST, simpleName, senderDeclBinding, 10, image));
		} else {
			if (binding == null) {
				label= Messages.format(CorrectionMessages.UnresolvedElementsSubProcessor_createfield_description, name);
				image= JavaPluginImages.get(JavaPluginImages.IMG_FIELD_PRIVATE);
			} else {