Avoid hash allocation for f(*r2k_ary) when def f(kw: 1)

When calling a method that accepts keywords but not a keyword
splat with a splatted array with a ruby2_keywords flagged hash,
there is no need to duplicate the ruby2_keywords flagged hash,
since it will be accessed to get the keyword values, but it will
not be modified.

1 files changed, 1 insertions, 1 deletions

diff --git a/vm_args.c b/vm_args.c
index 4449113790..abd9cf75f6 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -718,7 +718,7 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co
             if (RB_TYPE_P(rest_last, T_HASH) && FL_TEST_RAW(rest_last, RHASH_PASS_AS_KEYWORDS)) {
                 // def f(**kw); a = [..., kw]; g(*a)
                 splat_flagged_keyword_hash = rest_last;
-                if (!RHASH_EMPTY_P(rest_last) || (ISEQ_BODY(iseq)->param.flags.has_kwrest)) {
+                if (!(RHASH_EMPTY_P(rest_last) || ISEQ_BODY(iseq)->param.flags.has_kw) || (ISEQ_BODY(iseq)->param.flags.has_kwrest)) {
                     rest_last = rb_hash_dup(rest_last);
                 }
                 kw_flag |= VM_CALL_KW_SPLAT | VM_CALL_KW_SPLAT_MUT;