fcff8588a5
This patch doesn't ship all features of ES2015 variable/scoping changes, notably omitting the removal of legacy const. I think function hoisting, let and class in sloppy mode can stand to themselves as a package, and the legacy const change is much riskier and more likely to be reverted, so my intention is to pursue those as a separate, follow-on patch. R=adamk@chromium.org BUG=v8:4285,v8:3305 LOG=Y CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel Review URL: https://codereview.chromium.org/1551443002 Cr-Commit-Position: refs/heads/master@{#33133}
51 lines
2.2 KiB
JavaScript
51 lines
2.2 KiB
JavaScript
// Copyright 2011 the V8 project authors. All rights reserved.
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following
|
|
// disclaimer in the documentation and/or other materials provided
|
|
// with the distribution.
|
|
// * Neither the name of Google Inc. nor the names of its
|
|
// contributors may be used to endorse or promote products derived
|
|
// from this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
// With ES2015 function hoisting semantics, functions are only "hoisted" out
|
|
// of blocks by writing their values into var-scoped declarations. Therefore,
|
|
// they access the catch binding when it syntactically appears so.
|
|
// This is a potentially breaking change vs the old semantics, which would
|
|
// return 'function' from g() everywhere.
|
|
|
|
var x = 'global';
|
|
|
|
function f() {
|
|
var x = 'function';
|
|
assertEquals(undefined, g);
|
|
try {
|
|
assertEquals(undefined, g);
|
|
throw 'catch';
|
|
} catch (x) {
|
|
function g() { return x; }
|
|
assertEquals('catch', g());
|
|
}
|
|
assertEquals('catch', g());
|
|
return g;
|
|
}
|
|
|
|
assertEquals('catch', f()());
|