https://git.ruby-lang.org/ruby.git/commit/?id=5603681520

From 56036815207b803151b0c7215da3a880bbad6df1 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Fri, 6 Sep 2019 13:35:50 -0700
Subject: Enable keyword argument warnings when called from C

Previously, Ruby did not warn in these cases, and in some cases
did not have the same behavior.  This makes calls from C handled
the same way as calls from Ruby.

diff --git a/vm_args.c b/vm_args.c
index 1542607..7ffc756 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -786,7 +786,7 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co https://github.com/ruby/ruby/blob/trunk/vm_args.c#L786
 	 (kw_splat && given_argc > max_argc)) &&
 	args->kw_argv == NULL) {
         if (given_argc > min_argc) {
-            if (((kw_flag & (VM_CALL_KWARG | VM_CALL_KW_SPLAT)) || !ec->cfp->iseq /* called from C */)) {
+            if (kw_flag) {
                 int check_only_symbol = (kw_flag & VM_CALL_KW_SPLAT) &&
                                         iseq->body->param.flags.has_kw &&
                                         !iseq->body->param.flags.has_kwrest;
@@ -808,13 +808,10 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co https://github.com/ruby/ruby/blob/trunk/vm_args.c#L808
                  * def foo(k:1) p [k]; end
                  * foo({k:42}) #=> 42
                  */
-                if (ec->cfp->iseq) {
-                    /* called from Ruby level */
-                    rb_warn_last_hash_to_keyword(calling, ci, iseq);
-                }
+                rb_warn_last_hash_to_keyword(calling, ci, iseq);
                 given_argc--;
             }
-            else if (keyword_hash != Qnil && ec->cfp->iseq) {
+            else if (keyword_hash != Qnil) {
                 rb_warn_split_last_hash_to_keyword(calling, ci, iseq);
             }
         }
-- 
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