# 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
