Implement callwith for the wrapped sub case.

src/builtins/control.pir

@@ -114,7 +114,7 @@ the moment -- we'll do more complex handling a bit later.)
     continuation()
 .end
 
-=item next
+=item last
 
 =cut
 
@@ -126,6 +126,10 @@ the moment -- we'll do more complex handling a bit later.)
     throw e
 .end
 
+=item next
+
+=cut
+
 .sub 'next'
     .local pmc e
     e = new 'Exception'
@@ -134,6 +138,10 @@ the moment -- we'll do more complex handling a bit later.)
     throw e
 .end
 
+=item redo
+
+=cut
+
 .sub 'redo'
     .local pmc e
     e = new 'Exception'
@@ -142,6 +150,10 @@ the moment -- we'll do more complex handling a bit later.)
     throw e
 .end
 
+=item continue
+
+=cut
+
 .sub 'continue'
     .local pmc e
     e = new 'Exception'
@@ -150,6 +162,10 @@ the moment -- we'll do more complex handling a bit later.)
     throw e
 .end
 
+=item break
+
+=cut
+
 .sub 'break'
     .param pmc arg :optional
     .param int has_arg :opt_flag
@@ -410,6 +426,36 @@ on error.
 .end
 
 
+=item callwith
+
+=cut
+
+.sub 'callwith'
+    .param pmc pos_args    :slurpy
+    .param pmc named_args  :slurpy :named
+
+    # Is our caller a wrapping? If so, call inner.
+    .local pmc caller, inner
+    $P0 = new 'ParrotInterpreter'
+    caller = $P0['sub'; 1]
+  search_loop:
+    inner = getprop '$!wrap_inner', caller
+    if null inner goto try_outer
+    .tailcall inner(pos_args :flat, named_args :flat :named)
+  try_outer:
+    $I0 = isa caller, 'Routine' # Should not search out of current routine.
+    if $I0 goto not_wrapped
+    caller = caller.'get_outer'()
+    if null caller goto not_wrapped
+    $P0 = getprop '$!real_self', caller
+    if null $P0 goto search_loop
+    caller = $P0
+    goto search_loop
+
+  not_wrapped:
+    'die'('Use of callwith in non-wrapped case not yet implemented.')
+.end
+
 =back
 
 =head1 TODO: Functions