id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc	lang	patch	platform
1029	taillcall into PIR compiler broken	coke	whiteknight	"See [http://rt.perl.org/rt3/Ticket/Display.html?id=51206 Original RT]

If you apply this patch to parrot: 

{{{
index 776a062..4f1486f 100644
--- a/compilers/pct/src/PCT/HLLCompiler.pir
+++ b/compilers/pct/src/PCT/HLLCompiler.pir
@@ -512,8 +512,7 @@ Transform PAST C<source> into POST.
     .param pmc adverbs         :slurpy :named
 
     $P0 = compreg 'PIR'
-    $P1 = $P0(source)
-    .return ($P1)
+    .tailcall $P0(source)
 .end
}}}

This causes failures in rakudo. For example, ""class {}"" without the patch returns nothing in interactive mode, but with the patch, it returns a failure regarding the # of arguments expected.

A simple test of the tailcall (below) doesn't show this behavior.

{{{
.sub main 
  $P1 = elm()
  $P1()
.end

.sub elm

  $P1 = compreg 'PIR'
  $S0 =<<'END_PIR'
.sub foo
say 'ok'
.end
END_PIR
  .tailcall $P1($S0)
.end
}}}"	bug	closed	normal		none	trunk	high	fixed			perl6		all