From 4e88e8692844a2a317bc19481f0f2601b6f00955 Mon Sep 17 00:00:00 2001
From: manga_osyo <manga.osyo@gmail.com>
Date: Tue, 30 Apr 2019 23:18:44 +0900
Subject: Add exception support in `Range#first`.

Closes: https://github.com/ruby/ruby/pull/2163
---
 range.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'range.c')

diff --git a/range.c b/range.c
index 4180a663aa..03ca38d611 100644
--- a/range.c
+++ b/range.c
@@ -1012,6 +1012,9 @@ range_first(int argc, VALUE *argv, VALUE range)
 {
     VALUE n, ary[2];
 
+    if (NIL_P(RANGE_BEG(range))) {
+        rb_raise(rb_eRangeError, "cannot get the first element of beginless range");
+    }
     if (argc == 0) return RANGE_BEG(range);
 
     rb_scan_args(argc, argv, "1", &n);
-- 
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