1 files changed, 12 insertions, 25 deletions

diff --git a/vm_args.c b/vm_args.c
index 63749e1c2c..84ffd2e983 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -571,22 +571,6 @@ check_kwrestarg(VALUE keyword_hash, unsigned int *kw_flag)
     }
 }
 
-static void
-flatten_rest_args(rb_execution_context_t * const ec, struct args_info *args, VALUE * const locals, unsigned int *ci_flag)
-{
-    const VALUE *argv = RARRAY_CONST_PTR(args->rest);
-    int j, i=args->argc, rest_len = RARRAY_LENINT(args->rest)-1;
-    args->argc += rest_len;
-    if (rest_len) {
-        CHECK_VM_STACK_OVERFLOW(ec->cfp, rest_len+1);
-        for (i, j=0; rest_len > 0; rest_len--, i++, j++) {
-            locals[i] = argv[j];
-        }
-    }
-    args->rest = Qfalse;
-    *ci_flag &= ~VM_CALL_ARGS_SPLAT;
-}
-
 static int
 setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * const iseq,
                          struct rb_calling_info *const calling,
@@ -743,24 +727,27 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co
                 args->rest_dupped = false;
 
                 if (ignore_keyword_hash_p(rest_last, iseq, &kw_flag, &converted_keyword_hash)) {
-                    if (ISEQ_BODY(iseq)->param.flags.has_rest) {
+                    if (ISEQ_BODY(iseq)->param.flags.has_rest || arg_setup_type != arg_setup_method) {
                         // Only duplicate/modify splat array if it will be used
                         arg_rest_dup(args);
                         rb_ary_pop(args->rest);
                     }
-                    else if (arg_setup_type == arg_setup_block && !ISEQ_BODY(iseq)->param.flags.has_kwrest) {
-                        // Avoid hash allocation for empty hashes
-                        // Copy rest elements except empty keyword hash directly to VM stack
-                        flatten_rest_args(ec, args, locals, &ci_flag);
-                        keyword_hash = Qnil;
-                        kw_flag = 0;
-                    }
                     given_argc--;
                 }
                 else if (!ISEQ_BODY(iseq)->param.flags.has_rest) {
                     // Avoid duping rest when not necessary
                     // Copy rest elements and converted keyword hash directly to VM stack
-                    flatten_rest_args(ec, args, locals, &ci_flag);
+                    const VALUE *argv = RARRAY_CONST_PTR(args->rest);
+                    int j, i=args->argc, rest_len = RARRAY_LENINT(args->rest)-1;
+                    args->argc += rest_len;
+                    if (rest_len) {
+                        CHECK_VM_STACK_OVERFLOW(ec->cfp, rest_len+1);
+                        for (i, j=0; rest_len > 0; rest_len--, i++, j++) {
+                            locals[i] = argv[j];
+                        }
+                    }
+                    args->rest = Qfalse;
+                    ci_flag &= ~VM_CALL_ARGS_SPLAT;
 
                     if (ISEQ_BODY(iseq)->param.flags.has_kw || ISEQ_BODY(iseq)->param.flags.has_kwrest) {
                         given_argc--;