consider switches to be a valid scope - fixes #1297

src/babel/types/alias-keys.json

@@ -6,7 +6,7 @@
   "DoWhileStatement":         ["Statement", "Loop", "While", "Scopable"],
   "IfStatement":              ["Statement"],
   "ReturnStatement":          ["Statement"],
-  "SwitchStatement":          ["Statement"],
+  "SwitchStatement":          ["Statement", "Scopable"],
   "ThrowStatement":           ["Statement"],
   "TryStatement":             ["Statement"],
   "WhileStatement":           ["Statement", "Loop", "While", "Scopable"],

test/core/fixtures/transformation/es6.block-scoping/switch/actual.js

@@ -0,0 +1,11 @@
+let a = true;
+let b = false;
+
+switch (a) {
+  case true:
+    let b = 2;
+    break;
+  case false:
+    let c = 3;
+    break;
+}

test/core/fixtures/transformation/es6.block-scoping/switch/expected.js

@@ -0,0 +1,13 @@
+"use strict";
+
+var a = true;
+var b = false;
+
+switch (a) {
+  case true:
+    var b = 2;
+    break;
+  case false:
+    var c = 3;
+    break;
+}