Variables inside a try {} block used with andthen don't always get updated to correct values

[p6rt]

Migrated from rt.perl.org#130575 (status was 'resolved')

Searchable as RT130575$

[p6rt]

From @zoffixznet

<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

[p6rt]

From @zoffixznet

On Tue, 17 Jan 2017 10​:04​:11 -0800, cpan@​zoffix.com 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​: rakudo/rakudo@1ee89b54074e80c
Test​: Raku/roast@2f2998733a2d8132c

[p6rt]

@zoffixznet - Status changed from 'new' to 'resolved'