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 (argTypes == null || nSimilarElements == 0)  {
			return;
		}
		for (int i= 0; i < nSimilarElements; i++) {
			IMethodBinding elem = (IMethodBinding) similarElements.get(i);
			int diff= elem.getParameterTypes().length - argTypes.length;
			if (diff == 0) {
				int nProposals= proposals.size();
				doEqualNumberOfParameters(context, invocationNode, problem, arguments, argTypes, elem, proposals);
				if (nProposals != proposals.size()) {
					return; 
				}
			} else if (diff > 0) {
				doMoreParameters(context, problem, invocationNode, arguments, argTypes, elem, proposals);
			} else {
				doMoreArguments(context, problem, invocationNode, arguments, argTypes, elem, proposals);
			}
		}
	}
	private static void doMoreParameters(IInvocationContext context, IProblemLocation problem, ASTNode invocationNode, List arguments, ITypeBinding[] argTypes, IMethodBinding methodBinding, Collection proposals) throws CoreException {
		ITypeBinding[] paramTypes= methodBinding.getParameterTypes();
		int k= 0, nSkipped= 0;
		int diff= paramTypes.length - argTypes.length;
		int[] indexSkipped= new int[diff];
		for (int i= 0; i < paramTypes.length; i++) {
			if (k < argTypes.length && TypeRules.canAssign(argTypes[k], paramTypes[i])) {
				k++; 
			} else {
				if (nSkipped >= diff) {
					return;