https://git.ruby-lang.org/ruby.git/commit/?id=bb40c5cbe9

From bb40c5cbe977de9f36a2a739e94e9b2fd4496b6e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 14 Jan 2021 16:13:26 +0900
Subject: Ensure symbol list node is either NODE_STR or NODE_DSTR


diff --git a/parse.y b/parse.y
index 538153c..29784f3 100644
--- a/parse.y
+++ b/parse.y
@@ -10362,12 +10362,17 @@ new_defined(struct parser_params *p, NODE *expr, const YYLTYPE *loc) https://github.com/ruby/ruby/blob/trunk/parse.y#L10362
 static NODE*
 symbol_append(struct parser_params *p, NODE *symbols, NODE *symbol)
 {
-    if (nd_type(symbol) == NODE_DSTR) {
+    enum node_type type = nd_type(symbol);
+    switch (type) {
+      case NODE_DSTR:
 	nd_set_type(symbol, NODE_DSYM);
-    }
-    else {
+	break;
+      case NODE_STR:
 	nd_set_type(symbol, NODE_LIT);
 	RB_OBJ_WRITTEN(p->ast, Qnil, symbol->nd_lit = rb_str_intern(symbol->nd_lit));
+	break;
+      default:
+	compile_error(p, "unexpected node as symbol: %s", ruby_node_name(type));
     }
     return list_append(p, symbols, symbol);
 }
-- 
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