fixed evaluation context of eval(string) and instance_eval(string)

mrbgems/mruby-eval/src/eval.c

@@ -132,6 +132,9 @@ create_proc_from_string(mrb_state *mrb, char *s, int len, mrb_value binding, cha
   }
 
   proc = mrb_generate_code(mrb, p);
+  if (mrb->c->ci[-1].proc->target_class) {
+    proc->target_class = mrb->c->ci[-1].proc->target_class;
+  }
   e = (struct REnv*)mrb_obj_alloc(mrb, MRB_TT_ENV, (struct RClass*)mrb->c->ci[-1].proc->env);
   e->mid = mrb->c->ci[-1].mid;
   e->cioff = mrb->c->ci - mrb->c->cibase - 1;

mrbgems/mruby-eval/test/eval.rb

@@ -60,3 +60,16 @@ assert('String instance_eval') do
   assert_equal('test') { obj.instance_eval('@test') }
   assert_equal('test') { obj.instance_eval { @test } }
 end
+
+assert('Kernel.#eval(string) context') do
+  class TestEvalConstScope
+    EVAL_CONST_CLASS = 'class'
+    def const_string
+      eval 'EVAL_CONST_CLASS'
+    end
+  end
+  obj = TestEvalConstScope.new
+  assert_raise(NameError) { eval 'EVAL_CONST_CLASS' }
+  assert_equal('class') { obj.const_string }
+end
+