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
label= Messages.format(CorrectionMessages.UnresolvedElementsSubProcessor_swapparams_constr_description, args);
						} else {
							label= Messages.format(CorrectionMessages.UnresolvedElementsSubProcessor_swapparams_description, args);
						}
						Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
						ChangeMethodSignatureProposal proposal= new ChangeMethodSignatureProposal(label, targetCU, invocationNode, methodDecl, changeDesc, null, 5, image);
						proposals.add(proposal);
					}
				}
				return;
			}
		}
		if (declaringTypeDecl.isFromSource()) {
			ICompilationUnit targetCU= ASTResolving.findCompilationUnitForBinding(cu, astRoot, declaringTypeDecl);
			if (targetCU != null) {
				ChangeDescription[] changeDesc= createSignatureChangeDescription(indexOfDiff, nDiffs, paramTypes, arguments, argTypes);
				if (changeDesc != null) {
				
					IMethodBinding methodDecl= methodBinding.getMethodDeclaration();
					ITypeBinding[] declParamTypes= methodDecl.getParameterTypes();
	
					ITypeBinding[] newParamTypes= new ITypeBinding[changeDesc.length];
					for (int i= 0; i < newParamTypes.length; i++) {
						newParamTypes[i]= changeDesc[i] == null ? declParamTypes[i] : ((EditDescription) changeDesc[i]).type;
					}
	
					String[] args=  new String[] { ASTResolving.getMethodSignature(methodDecl, !targetCU.equals(cu)), ASTResolving.getMethodSignature(methodDecl.getName(), newParamTypes) };
					String label;
					if (methodDecl.isConstructor()) {
						label= Messages.format(CorrectionMessages.UnresolvedElementsSubProcessor_changeparamsignature_constr_description, args);