(perl #133778) adjust MARK if we extend the stack in pp_repeat

for a list repeat in scalar/void context

(cherry picked from commit d81b77352f66acde60db1b056b8eb3321b7b55fe)

2 files changed, 85 insertions, 2 deletions

diff --git a/pp.c b/pp.c
index 33eac6040d..def1950857 100644
--- a/pp.c
+++ b/pp.c
@@ -1693,7 +1693,8 @@ PP(pp_repeat)
 	    else {
 		dTOPss;
 		ASSUME(MARK + 1 == SP);
-		XPUSHs(sv);
+                MEXTEND(SP, 1);
+                PUSHs(sv);
 		MARK[1] = &PL_sv_undef;
 	    }
 	    SP = MARK + 2;
diff --git a/t/op/repeat.t b/t/op/repeat.t
index 978916689b..fa7ce06904 100644
--- a/t/op/repeat.t
+++ b/t/op/repeat.t
@@ -6,7 +6,7 @@ BEGIN {
     set_up_inc( '../lib' );
 }
 
-plan(tests => 49);
+plan(tests => 50);
 
 # compile time
 
@@ -192,3 +192,85 @@ fresh_perl_like(
 
 eval q{() = (() or ((0) x 0)); 1};
 is($@, "", "RT #130247");
+
+# yes, the newlines matter
+fresh_perl_is(<<'PERL', "", { stderr => 1 }, "(perl #133778) MARK mishandling");
+map{s[][];eval;0}<DATA>__END__
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