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
for (int i= diff - 1; i >= 0; i--) {
				int idx= indexSkipped[i];
				changeDesc[idx]= new RemoveDescription();
				changedTypes[i]= declParameterTypes[idx];
			}
			String[] arg= new String[] { ASTResolving.getMethodSignature(methodDecl, !cu.equals(targetCU)), getTypeNames(changedTypes) };
			String label;
			if (methodDecl.isConstructor()) {
				if (diff == 1) {
					label= Messages.format(CorrectionMessages.UnresolvedElementsSubProcessor_removeparam_constr_description, arg);
				} else {
					label= Messages.format(CorrectionMessages.UnresolvedElementsSubProcessor_removeparams_constr_description, arg);
				}
			} else {
				if (diff == 1) {
					label= Messages.format(CorrectionMessages.UnresolvedElementsSubProcessor_removeparam_description, arg);
				} else {
					label= Messages.format(CorrectionMessages.UnresolvedElementsSubProcessor_removeparams_description, arg);
				}
			}
			Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_REMOVE);
			ChangeMethodSignatureProposal proposal= new ChangeMethodSignatureProposal(label, targetCU, invocationNode, methodDecl, changeDesc, null, 5, image);
			proposals.add(proposal);
		}
	}
	private static String getTypeNames(ITypeBinding[] types) {
		StringBuffer buf= new StringBuffer();
		for (int i= 0; i < types.length; i++) {
			if (i > 0) {
				buf.append(", ");