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Avoid unsharing stack if env refers top-level; ref #3643
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matz committed May 25, 2017
1 parent e093112 commit f88cb88
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1 change: 1 addition & 0 deletions src/vm.c
Original file line number Diff line number Diff line change
Expand Up @@ -264,6 +264,7 @@ mrb_env_unshare(mrb_state *mrb, struct REnv *e)
mrb_value *p;

if (!MRB_ENV_STACK_SHARED_P(e)) return;
if (e->cioff == 0 && e->cxt.c == mrb->root_c) return;
MRB_ENV_UNSHARE_STACK(e);
if (!e->c) {
/* save block argument position (negated) */
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