Fix Integer#ceildiv to respect #coerce (#7118)

Fixes [Bug #19343]
ruby · Jan 22, 2023 · 20a85ab · 20a85ab
1 parent cad09f7
commit 20a85ab
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diff --git a/numeric.rb b/numeric.rb
@@ -278,7 +278,7 @@ def zero?
   #
   #    3.ceildiv(1.2) # => 3
   def ceildiv(other)
-    -div(-other)
+    -div(0 - other)
   end
 
   #

diff --git a/test/ruby/test_integer.rb b/test/ruby/test_integer.rb
@@ -725,5 +725,9 @@ def test_ceildiv
 
     assert_equal(10, (10**100-11).ceildiv(10**99-1))
     assert_equal(11, (10**100-9).ceildiv(10**99-1))
+
+    o = Object.new
+    def o.coerce(other); [other, 10]; end
+    assert_equal(124, 1234.ceildiv(o))
   end
 end