mirror of https://github.com/tc39/test262.git
34 lines
1.4 KiB
JavaScript
34 lines
1.4 KiB
JavaScript
// Copyright (C) 2015 Mozilla Corporation. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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author: Jeff Walden
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es6id: 13.3.1.1
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description: >
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let: |let let| split across two lines is not subject to automatic semicolon insertion.
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info: |
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|let| followed by a name is a lexical declaration. This is so even if the
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name is on a new line. ASI applies *only* if an offending token not allowed
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by the grammar is encountered, and there's no [no LineTerminator here]
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restriction in LexicalDeclaration or ForDeclaration forbidding a line break.
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It's a tricky point, but this is true *even if* the name is "let", a name that
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can't be bound by LexicalDeclaration or ForDeclaration. Per 5.3, static
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semantics early errors are validated *after* determining productions matching
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the source text.
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So in this testcase, the eval text matches LexicalDeclaration. No ASI occurs,
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because "let\nlet = ..." matches LexicalDeclaration before static semantics
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are considered. *Then* 13.3.1.1's static semantics for the LexicalDeclaration
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just chosen, per 5.3, are validated to recognize the Script as invalid. Thus
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the eval script can't be evaluated, and a SyntaxError is thrown.
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negative:
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phase: parse
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type: SyntaxError
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---*/
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$DONOTEVALUATE();
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let // start of a LexicalDeclaration, *not* an ASI opportunity
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let = "irrelevant initializer";
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