This is a dup of #129304, which has been fixed with c78f5dc7df5b1398d2867 , tests needed.
> On 19 Sep 2016, at 01:00, Benjamin Goldberg (via RT) > <perl6-bugs-follo...@perl.org> wrote: > > # New Ticket Created by Benjamin Goldberg > # Please include the string: [perl #129305] > # in the subject line of all future correspondence about this issue. > # <URL: https://rt.perl.org/Ticket/Display.html?id=129305 > > > > Here is a snippet from #perl6 on freenode: > > <BenGoldberg> m: ('a', 42, 'b', 22/7, 'c', 23).first(Int|Rat, :kv).say > <+camelia> rakudo-moar 641ee1: OUTPUT«any((1 42), (3 3.142857))» > > The result I expected was OUTPUT«(1 42)» > > The docs say that the first argument for .first is Mu $matcher, and therefor > autothreading should not happen. > > Rakudo implements .first using a couple of internal helper methods, > !first-accepts and !first-accepts-end, located here: > https://github.com/rakudo/rakudo/blob/641ee1e/src/core/Any-iterable-methods.pm#L1185 > and > https://github.com/rakudo/rakudo/blob/641ee1e/src/core/Any-iterable-methods.pm#L1201 > > Both of these helpers have a first argument of $test, which is untyped, and > is therefor of type Any. > > Because of this, when either of these helper methods is called with a > Junction, autothreading occurs. > > So, if you could add a couple of Mu’s, I’d appreciate it. > > Thanks, Ben Goldberg >
