Propagate kw_splat information

The kw_splat flag is whether the original call passes keyword or not.
Some types of methods (e.g., bmethod and sym_proc) drops the
information.  This change tries to propagate the flag to the final
callee, as far as I can.

1 files changed, 4 insertions, 1 deletions

diff --git a/vm_args.c b/vm_args.c
index ef3d9e2019..17eee5e65c 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -584,7 +584,10 @@ VALUE rb_iseq_location(const rb_iseq_t *iseq);
 static inline void
 rb_warn_keyword_to_last_hash(struct rb_calling_info *calling, const struct rb_call_info *ci, const rb_iseq_t * const iseq)
 {
-    if (calling->recv == Qundef) return;
+    if (calling->recv == Qundef) {
+        rb_warn("The keyword argument is passed as the last hash parameter");
+        return;
+    }
     VALUE name = rb_id2str(ci->mid);
     VALUE loc = rb_iseq_location(iseq);
     if (NIL_P(loc)) {