From: "Aleksi Niemelä" <aleksi.niemela@...>
Date: 2001-09-10T09:51:14+09:00
Subject: [ruby-talk:21025] A parsing bug in 1.7.1?

I encountered a possible parsing bug in latest nightly snapshot Ruby
1.7.1.

These work and don't work almost randomly :) :

[foo("bar")]               works
[foo("bar"),]              works
[foo ("bar")]              works
[foo ("bar"),]             doesn't work
[foo ("bar"), foo("bar")]  works
[foo ("bar"), foo("bar"),] doesn't

The reason for "doesn't work" is that 'foo ("bar"),' is parsed as a
method call and doesn't work for the same reason

   foo(3,)

doesn't work (expecting more arguments, as there's no optional comma at
the end of the arguments list in the grammar).

Why I'm filing this in the first place is that all of the above works
with 1.6.4 so there might be some regression here, or a deliberately
made choice for grammar change. In either case it might be good to raise
public awareness.

In any case it's nice to note array notation doesn't go along nicely as
expected (by a novice) with small whitespace adjustments. So

   [foo ("bar"), 2] is expected to be     [(foo("bar")), 2] by a novice
                    whereas it's actually [(foo("bar", 2))], while
   [foo("bar"), 2]  parses always as the expected one.

	- Aleksi

Ps. please excuse my company policy following this line


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