Updated test case and added comment

src/services/services.ts

@@ -4693,6 +4693,7 @@ module ts {
                 case SyntaxKind.ImportDeclaration:
                     return SemanticMeaning.Value | SemanticMeaning.Type | SemanticMeaning.Namespace;
 
+                // An external module can be a Value
                 case SyntaxKind.SourceFile:
                     return SemanticMeaning.Namespace | SemanticMeaning.Value;
             }

tests/cases/fourslash/quickInfoForRequire.ts

@@ -7,4 +7,5 @@
 ////import a = require("AA/B/*1*/B");
 
 goTo.marker('1');
-verify.quickInfoIs('module a');
+verify.quickInfoIs('module a');
+verify.referencesCountIs(0);