Ensure keyword splat method argument is hash

Commit e87d0882910001ef3b0c2ccd43bf00cee8c34a0c introduced a
regression where the keyword splat object passed by the caller
would be directly used by callee as keyword splat parameters,
if it implemented #to_hash.  The return value of #to_hash would be
ignored in this case.

1 files changed, 2 insertions, 0 deletions

diff --git a/vm_args.c b/vm_args.c
index 882966e432..3305b9bd33 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -549,6 +549,8 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co
             converted_keyword_hash = check_kwrestarg(converted_keyword_hash, &kw_flag);
             rb_ary_push(args->rest, converted_keyword_hash);
             keyword_hash = Qnil;
+        } else {
+            keyword_hash = converted_keyword_hash;
         }
 
         int len = RARRAY_LENINT(args->rest);