From @masak

* masak discovered a rakudobug!
<masak> m​: sub foo { say &^fn }; foo(42)
<camelia> rakudo-moar c2a57e​: OUTPUT«42␤»
<masak> hah!
<masak> I can't believe none of us has thought of that one before :P
* masak submits it
<raydiak> nice...works with all the sigils
<masak> m​: sub foo(&fn) { say &fn }; foo(42)
<camelia> rakudo-moar c2a57e​: OUTPUT«===SORRY!=== Error while
compiling [...]␤Calling foo(int) will never work with declared
signature (&fn) [...]
<masak> not only is the ordinary form checked, it's *checked at CHECK
time* and never even runs.

From @jnthn

On Wed May 27 10​:57​:47 2015, masak wrote​:

* masak discovered a rakudobug!
<masak> m​: sub foo { say &^fn }; foo(42)
<camelia> rakudo-moar c2a57e​: OUTPUT«42␤»
<masak> hah!
<masak> I can't believe none of us has thought of that one before :P
* masak submits it
<raydiak> nice...works with all the sigils
<masak> m​: sub foo(&fn) { say &fn }; foo(42)
<camelia> rakudo-moar c2a57e​: OUTPUT«===SORRY!=== Error while
compiling [...]␤Calling foo(int) will never work with declared
signature (&fn) [...]
<masak> not only is the ordinary form checked, it's *checked at CHECK
time* and never even runs.

Fixed, and tests added (for all the sigils) in S06-signature/mixed-placeholders.t.

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

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