Debug.assert(false) -> Debug.fail()

src/services/findAllReferences.ts

@@ -334,7 +334,7 @@ namespace ts.FindAllReferences.Core {
                     references.push({ type: "node", node: (decl as ts.ModuleDeclaration).name });
                     break;
                 default:
-                    Debug.assert(false);
+                    Debug.fail("Expected a module symbol to be declared by a SourceFile or ModuleDeclaration.");
             }
         }
 

src/services/importTracker.ts

@@ -405,7 +405,7 @@ namespace ts.FindAllReferences {
             case SyntaxKind.ExternalModuleReference:
                 return (decl as ExternalModuleReference).parent;
             default:
-                Debug.assert(false);
+                Debug.fail(`Unexpected module specifier parent: ${decl.kind}`);
         }
     }