From 087e1719e45ae51b728aa8b15edd30d9ef757a98 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Fri, 19 Mar 2021 07:13:19 +0900
Subject: `Float#divmod` with zero should cause `ZeroDivisionError`; #5384

---
 src/numeric.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/src/numeric.c b/src/numeric.c
index c536f0614..74e3a8b82 100644
--- a/src/numeric.c
+++ b/src/numeric.c
@@ -375,13 +375,9 @@ flodivmod(mrb_state *mrb, double x, double y, mrb_float *divp, mrb_float *modp)
     goto exit;
   }
   if (y == 0.0) {
-    if (x == 0) div = NAN;
-    else if (x > 0.0) div = INFINITY;
-    else div = -INFINITY;       /* x < 0.0 */
-    mod = NAN;
-    goto exit;
+    int_zerodiv(mrb);
   }
-  if ((x == 0.0) || (isinf(y) && !isinf(x))) {
+  if (isinf(y) && !isinf(x)) {
     mod = x;
   }
   else {
-- 
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