Issue #19343 has been reported by kyanagi (Kouhei Yanagita). ---------------------------------------- Bug #19343: Integer#ceildiv should respece #coerce https://bugs.ruby-lang.org/issues/19343 * Author: kyanagi (Kouhei Yanagita) * Status: Open * Priority: Normal * ruby -v: ruby 3.2.0 (2022-12-25 revision a528908271) [arm64-darwin21] * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- https://github.com/ruby/ruby/pull/7118 This issue is similar to #19335. ```Ruby c = Object.new def c.coerce(other) = [other, 10] p 1234 / c # => 123 p 1234.div(c) # => 123 p 1234.quo(c) # => (617/5) p 1234.fdiv(c) # => 123.4 p 1234.ceildiv(c) # => in `ceildiv': undefined method `-@' for #<Object:0x000000010250ad68> (NoMethodError) ``` -- https://bugs.ruby-lang.org/