https://git.ruby-lang.org/ruby.git/commit/?id=afab8122c3

From afab8122c339586ccb120861cc700aa8eee7402c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 23 Oct 2019 02:04:36 +0900
Subject: Fix the exception when CPDEBUG


diff --git a/compile.c b/compile.c
index c25ffbe..0ca8757 100644
--- a/compile.c
+++ b/compile.c
@@ -391,7 +391,10 @@ append_compile_error(const rb_iseq_t *iseq, int line, const char *fmt, ...) https://github.com/ruby/ruby/blob/trunk/compile.c#L391
     else if (!err_info) {
 	RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->err_info, Qtrue);
     }
-    if (compile_debug) rb_exc_fatal(err);
+    if (compile_debug) {
+        if (SPECIAL_CONST_P(err)) err = rb_eSyntaxError;
+        rb_exc_fatal(err);
+    }
 }
 
 #if 0
-- 
cgit v0.10.2


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