[perl #19078] wrong match order inside replacement

$ perl -le '$_="CCCGGG"; s!.!@a{print("[$&]"),/./}!g'
[C]
[C]
[C]
[C]
[C]
[C]

What’s happening is that the s/// does not reset PL_curpm for each
iteration, because it doesn’t usually have to.

The RHS’s scoping takes care of it most of the time. This happens with
the /e modifier and with @{...}.

In this example, though, we have a subscript, not a block. This sub-
script is in the same scope as the s/// itself.

The assumption that the substitution operator will never have to reset
PL_curpm itself appears to be incorrect. This fixes it.

1 files changed, 1 insertions, 0 deletions

diff --git a/pp_ctl.c b/pp_ctl.c
index 099d2aeb89..0a9dcfedd9 100644
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -377,6 +377,7 @@ PP(pp_substcont)
 	(void)ReREFCNT_inc(rx);
     cx->sb_rxtainted |= RX_MATCH_TAINTED(rx);
     rxres_save(&cx->sb_rxres, rx);
+    PL_curpm = pm;
     RETURNOP(pm->op_pmstashstartu.op_pmreplstart);
 }