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Message-ID: <2708624.1MEYokBNaJ@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Thu, 30 Aug 2012 15:59:43 +0200
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Subject: Re: Semicolons and the do..while statement
Newsgroups: comp.lang.javascript
References: <88f8c6ba-bc50-4695-b442-10f1dc377363@o8g2000yqm.googlegroups.com> <k1lopg$qsm$1@news.albasani.net> <4191624.W6QT1uhmCP@PointedEars.de> <KwGUp1Cpm2PQFwgv@J.A830F0FF37FB96852AD08924D9443D28E23ED5CD>
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John G Harris wrote:

> Thomas 'PointedEars' Lahn wrote:
>   <snip>
>>IOW,
>>
>>  do {} while (false) var x = 3;
>>
>>*is* equivalent to
>>
>>  do {} while (false); var x = 3;
>>
>>because `var' delimits a /VariableStatement/ and the parser is allowed, in
>>order to produce
>>
>   ...
>>
>>to insert the semicolon before the /VariableStatement/.  It's not a bug,
>>it's a feature, and a standards-compliant feature at that.
>   <snip>
> 
> This is not true. If you read ECMA 262 section 7.9.1 you will see that
> the gap between  (false)  and  var  does not match *any* of the
> situations where a semicolon can be inserted. The lack of a semicolon is
> therefore a syntax error.
> 
> Compilers that 'correct' programming errors are not being helpful. It
> can take a long time to track down an obscure bug caused by the compiler
> guessing wrong.

For crying out loud…

| 2 Conformance
| 
| […]
| A conforming implementation of ECMAScript is permitted to support program
| and regular expression syntax not described in this specification.  […]

This, if nothing else, is sufficient to make it standards-compliant.


PointedEars
-- 
Danny Goodman's books are out of date and teach practices that are
positively harmful for cross-browser scripting.
  -- Richard Cornford, cljs, <cife6q$253$1$8300dec7@news.demon.co.uk> (2004)