https://git.ruby-lang.org/ruby.git/commit/?id=39c37acf86

From 39c37acf86960ae745c4d690fe2d9dd38cd96fba Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Sat, 14 Sep 2019 02:21:37 -0700
Subject: Fix memory leak when adding empty keyword hashes

nagachika pointed out that ALLOC_N is actually just malloc, so
this memory wasn't being freed.  This shouldn't be a performance
sensitive code path, and will be going away after 2.7, so just
allocate a temp buffer that will be freed later by Ruby GC.

diff --git a/vm_eval.c b/vm_eval.c
index f124653..ba57d90 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -241,8 +241,9 @@ add_empty_keyword(int *argc, const VALUE **argv, int *kw_splat) https://github.com/ruby/ruby/blob/trunk/vm_eval.c#L241
     if (*kw_splat == RB_PASS_CALLED_KEYWORDS || *kw_splat == RB_PASS_EMPTY_KEYWORDS) {
         if (*kw_splat == RB_PASS_EMPTY_KEYWORDS || rb_empty_keyword_given_p()) {
             int n = *argc;
-            VALUE *ptr = ALLOC_N(VALUE,n+1);
-
+            VALUE v;
+            VALUE *ptr;
+            ptr = rb_alloc_tmp_buffer2(&v, n, sizeof(VALUE));
             memcpy(ptr, *argv, sizeof(VALUE)*n);
             ptr[n] = rb_hash_new();
             *argc = ++n;
-- 
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