Addressed PR feedback

Author: vladima

src/services/services.ts

@@ -3506,9 +3506,16 @@ namespace ts {
                         // through type declaration or inference.
                         // Also proceed if rootDeclaration is parameter and if its containing function expression\arrow function is contextually typed -
                         // type of parameter will flow in from the contextual type of the function
-                        if (rootDeclaration.initializer ||
-                            rootDeclaration.type ||
-                            (rootDeclaration.kind === SyntaxKind.Parameter && isExpression(rootDeclaration.parent) && typeChecker.getContextualType(<Expression>rootDeclaration.parent))) {
+                        let canGetType = !!(rootDeclaration.initializer || rootDeclaration.type);
+                        if (!canGetType && rootDeclaration.kind === SyntaxKind.Parameter) {
+                            if (isExpression(rootDeclaration.parent)) {
+                                canGetType = !!typeChecker.getContextualType(<Expression>rootDeclaration.parent);
+                            }
+                            else if (rootDeclaration.parent.kind === SyntaxKind.MethodDeclaration || rootDeclaration.parent.kind === SyntaxKind.SetAccessor) {
+                                canGetType = isExpression(rootDeclaration.parent.parent) && !!typeChecker.getContextualType(<Expression>rootDeclaration.parent.parent);
+                            }
+                        }
+                        if (canGetType) {
                             typeForObject = typeChecker.getTypeAtLocation(objectLikeContainer);
                             existingMembers = (<BindingPattern>objectLikeContainer).elements;
                         }

tests/cases/fourslash/objectLiteralBindingInParameter.ts

@@ -6,10 +6,30 @@
 
 ////[<I>null].reduce(({/*2*/}, b) => b);
 
+////interface Foo {
+////    m(x: { x1: number, x2: number }): void;
+////    prop: I;
+////}
+////let x: Foo = {
+////    m({ /*3*/ }) {
+////    },
+////    get prop(): I { return undefined; },
+////    set prop({ /*4*/ }) {
+////    }
+////};
+
 goTo.marker("1");
 verify.completionListContains("x1");
 verify.completionListContains("x2");
 
 goTo.marker("2");
 verify.completionListContains("x1");
+verify.completionListContains("x2");
+
+goTo.marker("3");
+verify.completionListContains("x1");
+verify.completionListContains("x2");
+
+goTo.marker("4");
+verify.completionListContains("x1");
 verify.completionListContains("x2");