Fix name printing in signature help

Author: JsonFreeman

src/compiler/types.ts

@@ -923,7 +923,7 @@ module ts {
         resolvedReturnType: Type;           // Resolved return type
         minArgumentCount: number;           // Number of non-optional parameters
         hasRestParameter: boolean;          // True if last parameter is rest parameter
-        hasStringLiterals: boolean;         // True if instantiated
+        hasStringLiterals: boolean;         // True if specialized
         target?: Signature;                 // Instantiation target
         mapper?: TypeMapper;                // Instantiation mapper
         erasedSignatureCache?: Signature;   // Erased version of signature (deferred)

src/services/services.ts

@@ -3561,11 +3561,13 @@ module ts {
                         if (isOptional) {
                             display += "?";
                         }
-                        display += ": " + typeInfoResolver.typeToString(typeInfoResolver.getTypeOfSymbol(p));
+                        display += ": " + typeInfoResolver.typeToString(typeInfoResolver.getTypeOfSymbol(p), argumentListOrTypeArgumentList);
                         return new SignatureHelpParameter(p.name, "", display, isOptional);
                     });
-                    var prefix = (candidateSignature.declaration.name.text || "") + "(";
-                    var suffix = "): " + typeInfoResolver.typeToString(candidateSignature.getReturnType());
+                    var callTarget = (<CallExpression>argumentListOrTypeArgumentList.parent).func;
+                    var signatureName = typeInfoResolver.symbolToString(typeInfoResolver.getSymbolInfo(callTarget), /*enclosingDeclaration*/ undefined, /*meaning*/ undefined);
+                    var prefix = signatureName + "(";
+                    var suffix = "): " + typeInfoResolver.typeToString(candidateSignature.getReturnType(), argumentListOrTypeArgumentList);
                     return new SignatureHelpItem(candidateSignature.hasRestParameter, prefix, suffix, ", ", parameterHelpItems, "");
                 });
                 var selectedItemIndex = candidates.indexOf(bestSignature);