Handle case where ruby2_keywords method splats to ruby2_keywords method

Previously, the keyword hash was duped (which results in a regular
hash), but the dup was not marked as a keyword hash, causing the
hash not to be marked as keyword hash even though it should be.

1 files changed, 3 insertions, 0 deletions

diff --git a/vm_args.c b/vm_args.c
index 6fce593bf1..96fce15d62 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -740,6 +740,9 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co
                 rest_last = rb_hash_dup(rest_last);
                 RARRAY_ASET(args->rest, len - 1, rest_last);
                 kw_flag |= VM_CALL_KW_SPLAT;
+                if (iseq->body->param.flags.ruby2_keywords) {
+                    remove_empty_keyword_hash = 0;
+                }
             }
             else {
                 rest_last = 0;