let-let-declaration-with-initializer-split-across-two-lines.js (1442B)
1 // |reftest| error:SyntaxError 2 // Copyright (C) 2015 Mozilla Corporation. All rights reserved. 3 // This code is governed by the BSD license found in the LICENSE file. 4 5 /*--- 6 author: Jeff Walden 7 es6id: 13.3.1.1 8 description: > 9 let: |let let| split across two lines is not subject to automatic semicolon insertion. 10 info: | 11 |let| followed by a name is a lexical declaration. This is so even if the 12 name is on a new line. ASI applies *only* if an offending token not allowed 13 by the grammar is encountered, and there's no [no LineTerminator here] 14 restriction in LexicalDeclaration or ForDeclaration forbidding a line break. 15 16 It's a tricky point, but this is true *even if* the name is "let", a name that 17 can't be bound by LexicalDeclaration or ForDeclaration. Per 5.3, static 18 semantics early errors are validated *after* determining productions matching 19 the source text. 20 21 So in this testcase, the eval text matches LexicalDeclaration. No ASI occurs, 22 because "let\nlet = ..." matches LexicalDeclaration before static semantics 23 are considered. *Then* 13.3.1.1's static semantics for the LexicalDeclaration 24 just chosen, per 5.3, are validated to recognize the Script as invalid. Thus 25 the eval script can't be evaluated, and a SyntaxError is thrown. 26 negative: 27 phase: parse 28 type: SyntaxError 29 ---*/ 30 31 $DONOTEVALUATE(); 32 33 let // start of a LexicalDeclaration, *not* an ASI opportunity 34 let = "irrelevant initializer";