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/ASTResolving.java
return parent.getAST().resolveWellKnownType("java.lang.Exception"); 
		case ASTNode.FIELD_ACCESS:
			if (node.equals(((FieldAccess) parent).getName())) {
				return getPossibleReferenceBinding(parent);
			}
			break;
		case ASTNode.SUPER_FIELD_ACCESS:
			return getPossibleReferenceBinding(parent);
		case ASTNode.QUALIFIED_NAME:
			if (node.equals(((QualifiedName) parent).getName())) {
				return getPossibleReferenceBinding(parent);
			}
			break;
		case ASTNode.SWITCH_CASE:
			if (node.equals(((SwitchCase) parent).getExpression()) && parent.getParent() instanceof SwitchStatement) {
				return ((SwitchStatement) parent.getParent()).getExpression().resolveTypeBinding();
			}
			break;
		default:
			
		}
		return null;
	}
	private static IMethodBinding guessContructorBinding(ITypeBinding superclass, List arguments) {
		IMethodBinding[] declaredMethods= superclass.getDeclaredMethods();
		for (int i= 0; i < declaredMethods.length; i++) {
			IMethodBinding curr= declaredMethods[i];
			if (curr.isConstructor() && curr.getParameterTypes().length == arguments.size()) {
				return curr;
			}