Arrow functions missing support for params annotations and return types

google / traceur-compiler

Traceur is a JavaScript.next-to-JavaScript-of-today compiler

Apache License 2.0

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Arrow functions missing support for params annotations and return types #1580

Open viatsyshyn opened 9 years ago

viatsyshyn commented 9 years ago

var a = (@Ann a:number):string => {};

traceured.js:1:10: Unexpected token @
traceured.js:1:16: Unexpected token :
traceured.js:1:24: Semi-colon expected
traceured.js:1:24: Unexpected token :
traceured.js:1:25: Semi-colon expected

arv commented 9 years ago

@vicb @vojtajina

arv commented 9 years ago

It is not clear how this can work since the arrow parameters is a cover grammar for paren expressions. TypeScript uses back tracking which is not acceptable.