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
if (methodBinding != null) {
				return getParameterTypeBinding(node, methodInvocation.arguments(), methodBinding);
			}
			break;
		case ASTNode.SUPER_CONSTRUCTOR_INVOCATION: {
			SuperConstructorInvocation superInvocation= (SuperConstructorInvocation) parent;
			IMethodBinding superBinding= superInvocation.resolveConstructorBinding();
			if (superBinding == null) { 
				ITypeBinding parentType= Bindings.getBindingOfParentType(parent);
				if (parentType != null && parentType.getSuperclass() != null) {
					superBinding= guessContructorBinding(parentType.getSuperclass(), superInvocation.arguments());
				}
			}
			if (superBinding != null) {
				return getParameterTypeBinding(node, superInvocation.arguments(), superBinding);
			}
			break;
		}
		case ASTNode.CONSTRUCTOR_INVOCATION: {
			ConstructorInvocation constrInvocation= (ConstructorInvocation) parent;
			IMethodBinding constrBinding= constrInvocation.resolveConstructorBinding();
			if (constrBinding == null) { 
				ITypeBinding parentType= Bindings.getBindingOfParentType(parent);
				if (parentType != null) {
					constrBinding= guessContructorBinding(parentType, constrInvocation.arguments());
				}
			}
			if (constrBinding != null) {
				return getParameterTypeBinding(node, constrInvocation.arguments(), constrBinding);
			}