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Id: 126804
Status: new
Priority: 0/
Queue: perl6

Owner: Nobody
Requestors: jns+bc [at]

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Tag: Bug
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Subject: [BUG] use of module that defines traits within class scope hides locally defined traits
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Hi, there is, to me anyway, an unexpected change in behaviour between 2015.11-163-g2897239 and 2015.11-347-g47d2daf . If it is expected then I am quite happy to accept that (with the behaviour documented,) but it does look unintended to me. Given module TR { multi sub trait_mod:<is> (Attribute:D $a, :$some-trait!) is export { } } And class Foo { use TR; multi sub trait_mod:<is> (Attribute $a, :$other-trait) is export { } } Then "tr": use Foo; class Womble { has $.foo is other-trait; } results (in the latter revision): Can't use unknown trait 'is other-trait' in an attribute declaration. at /home/jonathan/devel/perl6/tr:4 expecting any of: rw readonly box_target leading_docs trailing_docs But moving the "use TR;" outside the Foo class block makes the trait from within Foo to be recognised. It works in both ways in the 2015.11-163-g2897239 This does have ecosystem implications (see e.g. ) so if it is actually a conscious change in behaviour (and not an unintended consequence of some other change,) it probably needs to be clearly documented somewhere. Thanks.
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Just bisected this on rakudo-moar and it appears that: 87288285f6f398ec7cba0900312ced4b580d79ed is the first bad commit commit 87288285f6f398ec7cba0900312ced4b580d79ed Author: Stefan Seifert <> Date: Sat Nov 14 10:43:38 2015 +0100 Have Repository::FileSystem automatically precompile files We now precompile loaded modules automatically. However, we cannot do this anymore as soon as we encounter a 'use lib' as this changes the precompilation store used. Consider: use Test; use lib 'foo'; use Test::Util; # which again uses Test Test::Util would be loaded from a different precompilation store that contains a different precompiled version of Test to the one already loaded. :040000 040000 67079ac3caa0dea4eab121fa09edfcd14306559c 48e40ca79a4922c6fa912cfd387235e5ddd6f258 M src Not quite sure where that leaves us.
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It appears (as suggested by nine on IRC,) that changing the 'tr' to: use Test; use lib '.'; use Foo; class Womble { has $.foo is other-trait; } and running it without a '-I.' gets rid of the error, this would suggest there may have been a pre-existing pre-compilation problem, that got exposed when everything was precompiled again.
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This is stll present as of Rakudo version 2016.03-110-g5bfc8fb built on MoarVM version 2016.03-104-g10d397

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