| // Copyright 2015 Mike Pennisi. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| es6id: 8.1.1.2.1 |
| description: > |
| True-coercing `Symbol.unscopables` properties block access to object environment record |
| info: | |
| [...] |
| 6. If the withEnvironment flag of envRec is false, return true. |
| 7. Let unscopables be Get(bindings, @@unscopables). |
| 8. ReturnIfAbrupt(unscopables). |
| 9. If Type(unscopables) is Object, then |
| a. Let blocked be ToBoolean(Get(unscopables, N)). |
| b. ReturnIfAbrupt(blocked). |
| c. If blocked is true, return false. |
| |
| ES6: 13.11.7 (The `with` Statement) Runtime Semantics: Evaluation |
| [...] |
| 6. Set the withEnvironment flag of newEnv’s EnvironmentRecord to true. |
| [...] |
| flags: [noStrict] |
| features: [Symbol.unscopables] |
| ---*/ |
| |
| var x = 0; |
| var env = { x: 1 }; |
| env[Symbol.unscopables] = { x: true }; |
| |
| with (env) { |
| assert.sameValue(x, 0, 'literal `true` value'); |
| } |
| |
| env[Symbol.unscopables].x = 'string'; |
| with (env) { |
| assert.sameValue(x, 0, 'non-empty string values'); |
| } |
| |
| env[Symbol.unscopables].x = 86; |
| with (env) { |
| assert.sameValue(x, 0, 'non-zero number values'); |
| } |
| |
| env[Symbol.unscopables].x = {}; |
| with (env) { |
| assert.sameValue(x, 0, 'object values'); |
| } |
| |
| env[Symbol.unscopables].x = Symbol.unscopables; |
| with (env) { |
| assert.sameValue(x, 0, 'Symbol values'); |
| } |