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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 f88cb8807343c91c2fbad486aa6b09ccee0b9643
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  1. +1 −0 src/vm.c
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@@ -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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