https://git.ruby-lang.org/ruby.git/commit/?id=8cd845aa5b

From 8cd845aa5b69e49c1092a482f8c14f85f899e038 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Wed, 4 Sep 2019 17:00:09 -0700
Subject: add debugging code to the mark function


diff --git a/node.c b/node.c
index 7ebc1cb..7c73bb8 100644
--- a/node.c
+++ b/node.c
@@ -1276,6 +1276,8 @@ mark_ast_value(void *ctx, NODE * node) https://github.com/ruby/ruby/blob/trunk/node.c#L1276
         case NODE_ARYPTN:
             rb_gc_mark(node->nd_lit);
             break;
+        default:
+            rb_bug("unreachable");
     }
 }
 
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