[perl #130575] [BUG] Variables inside a try {} block used with `andthen` don't always get updated to correct values

[email protected] ("Zoffix Znet via RT") Fri, 26 Jan 2018 02:57:09 -0800

Newsgroups	perl.perl6.compiler
Message-ID	<[email protected]>

On Tue, 17 Jan 2017 10:04:11 -0800, [email protected] wrote:
> <ZoffixW> m: sub itcavuc ($c) { (try say $c) andthen 42 }; itcavuc $_
> for 2, 4, 6
> <camelia> rakudo-moar 7d5bbe: OUTPUT«2␤4␤6␤»
> <ZoffixW> m: sub itcavuc ($c) { try {say $c} andthen 42 }; itcavuc $_
> for 2, 4, 6
> <camelia> rakudo-moar 7d5bbe: OUTPUT«2␤2␤4␤»
> 
> The block `try {}` seems to have repeated `2` and missing `6` in the
> output. The bug seems to occur with a combination of a block form of
> `try` and `andthen` (which thunks)
> 
> A few more cases: https://irclog.perlgeek.de/perl6/2017-01-
> 17#i_13936831


Thank you for the report. This is now fixed.

Fix:  https://github.com/rakudo/rakudo/commit/1ee89b54074e80c
Test: https://github.com/perl6/roast/commit/2f2998733a2d8132c