fix env->stack misadjusting

src/vm.c

@@ -141,7 +141,7 @@ stack_init(mrb_state *mrb)
 }
 
 static inline void
-envadjust(mrb_state *mrb, mrb_value *oldbase, mrb_value *newbase, size_t size)
+envadjust(mrb_state *mrb, mrb_value *oldbase, mrb_value *newbase, size_t oldsize)
 {
   mrb_callinfo *ci = mrb->c->cibase;
 
@@ -151,7 +151,7 @@ envadjust(mrb_state *mrb, mrb_value *oldbase, mrb_value *newbase, size_t size)
     mrb_value *st;
 
     if (e && MRB_ENV_STACK_SHARED_P(e) &&
-        (st = e->stack) && oldbase <= st && st < oldbase+size) {
+        (st = e->stack) && oldbase <= st && st < oldbase+oldsize) {
       ptrdiff_t off = e->stack - oldbase;
 
       e->stack = newbase + off;
@@ -161,7 +161,7 @@ envadjust(mrb_state *mrb, mrb_value *oldbase, mrb_value *newbase, size_t size)
       e = MRB_PROC_ENV(ci->proc);
 
       if (e && MRB_ENV_STACK_SHARED_P(e) &&
-          (st = e->stack) && oldbase <= st && st < oldbase+size) {
+          (st = e->stack) && oldbase <= st && st < oldbase+oldsize) {
         ptrdiff_t off = e->stack - oldbase;
 
         e->stack = newbase + off;
@@ -205,7 +205,7 @@ stack_extend_alloc(mrb_state *mrb, int room)
     mrb_exc_raise(mrb, mrb_obj_value(mrb->stack_err));
   }
   stack_clear(&(newstack[oldsize]), size - oldsize);
-  envadjust(mrb, oldbase, newstack, size);
+  envadjust(mrb, oldbase, newstack, oldsize);
   mrb->c->stbase = newstack;
   mrb->c->stack = mrb->c->stbase + off;
   mrb->c->stend = mrb->c->stbase + size;