From 8455344bf3fd92ca00f598accfe6b3eb29ddcb0c Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Fri, 6 Nov 2020 12:52:18 +0900
Subject: Skip too big left shift in `flo_shift()`.

---
 src/numeric.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/numeric.c b/src/numeric.c
index 988342e88..fcabc6d60 100644
--- a/src/numeric.c
+++ b/src/numeric.c
@@ -611,6 +611,10 @@ flo_shift(mrb_state *mrb, mrb_value x, mrb_int width)
     return x;
   }
   val = mrb_float(x);
+  if (width < -MRB_INT_BIT/2) {
+    if (val < 0) return mrb_fixnum_value(-1);
+    return mrb_fixnum_value(0);
+  }
   if (width < 0) {
     while (width++) {
       val /= 2;
-- 
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