From @masak

<moritz_> rakudo​: sub f($t?) { say defined($t).Int }; f("a" => 3)
<p6eval> rakudo 692aa1​: ( no output )
<moritz_> gives "Method 'Int' not found for invocant of class 'Pair'" locally
<moritz_> which is wrong too, no?
<moritz_> is defined() parsed specially?
<masak> moritz_​: no.
<moritz_> so another bug?
<masak> let me confirm locally.
<TimToady> rakudo​: say defined("a" => 3).WHAT
<p6eval> rakudo 692aa1​: OUTPUT«0␤»
<masak> moritz_​: I get the same.
* masak submits rakudobug
<masak> rakudo​: sub f($t?) { say defined($t).WHAT }; f()
<p6eval> rakudo 692aa1​: OUTPUT«0␤»
<masak> o.O

From @moritz

Golfing even further​:

perl6 -e 'defined("a" => 3).Int'
Method 'Int' not found for invocant of class 'Pair'

16​:54 < tylercurtis> moritz​: I think that's parsing as defined(("a" =>
3).Int).

The RT System itself - Status changed from 'new' to 'open'

From @coke

On Sun Jul 18 08​:02​:35 2010, moritz wrote​:

Golfing even further​:

perl6 -e 'defined("a" => 3).Int'
Method 'Int' not found for invocant of class 'Pair'

16​:54 < tylercurtis> moritz​: I think that's parsing as defined(("a" =>
3).Int).

Unchanged​:

19​:16 < [Coke]> rakudo​: sub f($t?) { say defined($t).Int }; f("a" => 3)
19​:16 <+p6eval> rakudo 38907e​: OUTPUT«Method 'Int' not found for invocant of
  class 'Pair'␤ in sub f at /tmp/Szt0vkNBsZ​:1␤ in block <anon>
  at /tmp/Szt0vkNBsZ​:1␤ in <anon> at /tmp/Szt0vkNBsZ​:1␤»

--
Will "Coke" Coleda

From @moritz

FWIW the problem was that 'defined' was a prefix op in rakudo, and had a
precedence tighter than infix =>.

I have changed it now to be an ordinary listop, and added tests to
S32-scalar/defined.t.

@moritz - Status changed from 'open' to 'resolved'