Use proper target_class to define class/module; fix #3843

The outer class of the class/module definition should be taken from
`MRB_TARGET_CLASS(mrb->c->ci->proc)` not `mrb->c->ci->target_class`
which is the target of constant lookups.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/vm.c b/src/vm.c
index 8d5bbc6d8..52eca83aa 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -2731,7 +2731,7 @@ RETRY_TRY_BLOCK:
       base = regs[a];
       super = regs[a+1];
       if (mrb_nil_p(base)) {
-        baseclass = mrb->c->ci->target_class;
+        baseclass = MRB_PROC_TARGET_CLASS(mrb->c->ci->proc);
         base = mrb_obj_value(baseclass);
       }
       c = mrb_vm_define_class(mrb, base, super, id);
@@ -2749,7 +2749,7 @@ RETRY_TRY_BLOCK:
 
       base = regs[a];
       if (mrb_nil_p(base)) {
-        baseclass = mrb->c->ci->target_class;
+        baseclass = MRB_PROC_TARGET_CLASS(mrb->c->ci->proc);
         base = mrb_obj_value(baseclass);
       }
       c = mrb_vm_define_module(mrb, base, id);