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 (nDiffs == 0) {
			if (nameNode.getParent() instanceof MethodInvocation) {
				MethodInvocation inv= (MethodInvocation) nameNode.getParent();
				if (inv.getExpression() == null) {
					addQualifierToOuterProposal(context, inv, methodBinding, proposals);
				}
			}
			return;
		}
		if (nDiffs == 1) { 
			int idx= indexOfDiff[0];
			Expression nodeToCast= (Expression) arguments.get(idx);
			ITypeBinding castType= paramTypes[idx];
			castType= Bindings.normalizeTypeBinding(castType);
			if (castType.isWildcardType()) {
				castType= ASTResolving.normalizeWildcardType(castType, false, nodeToCast.getAST());
			}
			if (castType != null) {
				ITypeBinding binding= nodeToCast.resolveTypeBinding();
				if (binding == null || binding.isCastCompatible(castType)) {
					String castTypeName= castType.getQualifiedName();
					ASTRewriteCorrectionProposal proposal= TypeMismatchSubProcessor.createCastProposal(context, castTypeName, castType, nodeToCast, 6);
					String[] arg= new String[] { getArgumentName(cu, arguments, idx), castTypeName};
					proposal.setDisplayName(Messages.format(CorrectionMessages.UnresolvedElementsSubProcessor_addargumentcast_description, arg));
					proposals.add(proposal);
				}
				TypeMismatchSubProcessor.addChangeSenderTypeProposals(context, nodeToCast, castType, false, 5, proposals);
			}
		}