Update #18576

scripts/ior.ts

@@ -64,7 +64,6 @@ module Commands {
             }
             if (path.charAt(1) === ":") {
                 if (path.charAt(2) === directorySeparator) return 3;
-                return 2;
             }
             return 0;
         }

src/compiler/core.ts

@@ -1574,7 +1574,6 @@ namespace ts {
         }
         if (path.charCodeAt(1) === CharacterCodes.colon) {
             if (path.charCodeAt(2) === CharacterCodes.slash) return 3;
-            return 2;
         }
         // Per RFC 1738 'file' URI schema has the shape file://<host>/<path>
         // if <host> is omitted then it is assumed that host value is 'localhost',

tests/baselines/reference/declarationEmitRelativeModuleError.errors.txt

@@ -0,0 +1,13 @@
+tests/cases/compiler/declarationEmitRelativeModuleError.ts(5,16): error TS2436: Ambient module declaration cannot specify relative module name.
+
+
+==== tests/cases/compiler/declarationEmitRelativeModuleError.ts (1 errors) ====
+    declare module "b:block" { // <-- no error anymore
+
+    }
+
+    declare module "b:/block" { // <-- still an error
+                   ~~~~~~~~~~
+!!! error TS2436: Ambient module declaration cannot specify relative module name.
+
+    }

tests/baselines/reference/declarationEmitRelativeModuleError.js

@@ -0,0 +1,10 @@
+//// [declarationEmitRelativeModuleError.ts]
+declare module "b:block" { // <-- no error anymore
+
+}
+
+declare module "b:/block" { // <-- still an error
+
+}
+
+//// [declarationEmitRelativeModuleError.js]

tests/baselines/reference/declarationEmitRelativeModuleError.symbols

@@ -0,0 +1,9 @@
+=== tests/cases/compiler/declarationEmitRelativeModuleError.ts ===
+declare module "b:block" { // <-- no error anymore
+No type information for this code.    
+No type information for this code.}
+No type information for this code.
+No type information for this code.declare module "b:/block" { // <-- still an error
+No type information for this code.    
+No type information for this code.}
+No type information for this code.

tests/baselines/reference/declarationEmitRelativeModuleError.types

@@ -0,0 +1,9 @@
+=== tests/cases/compiler/declarationEmitRelativeModuleError.ts ===
+declare module "b:block" { // <-- no error anymore
+No type information for this code.    
+No type information for this code.}
+No type information for this code.
+No type information for this code.declare module "b:/block" { // <-- still an error
+No type information for this code.    
+No type information for this code.}
+No type information for this code.

tests/cases/compiler/declarationEmitRelativeModuleError.ts

@@ -0,0 +1,7 @@
+declare module "b:block" { // <-- no error anymore
+
+}
+
+declare module "b:/block" { // <-- still an error
+
+}

tests/webTestServer.ts

@@ -61,7 +61,6 @@ function getRootLength(path: string): number {
     }
     if (path.charAt(1) === ":") {
         if (path.charAt(2) === directorySeparator) return 3;
-        return 2;
     }
     // Per RFC 1738 'file' URI schema has the shape file://<host>/<path>
     // if <host> is omitted then it is assumed that host value is 'localhost',