https://git.ruby-lang.org/ruby.git/commit/?id=199bd851e4

From 199bd851e40438380b2e0f57662a212200e3ba1a Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Thu, 5 Dec 2019 14:51:07 +0900
Subject: parse.y: suppress "set but not used" warnings on ripper.y


diff --git a/parse.y b/parse.y
index 3d762c2..7de84ee 100644
--- a/parse.y
+++ b/parse.y
@@ -11713,18 +11713,17 @@ new_bodystmt(struct parser_params *p, NODE *head, NODE *rescue, NODE *rescue_els https://github.com/ruby/ruby/blob/trunk/parse.y#L11713
 static void
 warn_unused_var(struct parser_params *p, struct local_vars *local)
 {
-    int i, cnt;
-    ID *v, *u;
+    int cnt;
 
     if (!local->used) return;
-    v = local->vars->tbl;
-    u = local->used->tbl;
     cnt = local->used->pos;
     if (cnt != local->vars->pos) {
 	rb_parser_fatal(p, "local->used->pos != local->vars->pos");
     }
 #ifndef RIPPER
-    for (i = 0; i < cnt; ++i) {
+    ID *v = local->vars->tbl;
+    ID *u = local->used->tbl;
+    for (int i = 0; i < cnt; ++i) {
 	if (!v[i] || (u[i] & LVAR_USED)) continue;
 	if (is_private_local_id(v[i])) continue;
 	rb_warn1L((int)u[i], "assigned but unused variable - %"PRIsWARN, rb_id2str(v[i]));
-- 
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