From: kimmo.lehto@... Date: 2017-05-12T09:26:34+00:00 Subject: [ruby-core:81125] [Ruby trunk Bug#13558] Array#insert does not typecheck the position argument if it's the only argument Issue #13558 has been reported by kke (Kimmo Lehto). ---------------------------------------- Bug #13558: Array#insert does not typecheck the position argument if it's the only argument https://bugs.ruby-lang.org/issues/13558 * Author: kke (Kimmo Lehto) * Status: Open * Priority: Normal * Assignee: * Target version: * ruby -v: ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16] * Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN ---------------------------------------- **rb_ary_insert** does this: ~~~ c if (argc == 1) return ary; ~~~ For Ruby this means: ~~~ ruby > [].insert("foo") => [] > [].insert(Exception.new) => [] ~~~ I would expect this to raise a TypeError. The problem here is that if you forget the position argument, because perhaps you thought Array#insert would be an alias for Array#unshift, you get unexpected results and no errors. If you try to insert two items it fails nicely: ~~~ ruby > [].insert('foo', 'foo') TypeError: no implicit conversion of String into Integer ~~~ -- https://bugs.ruby-lang.org/ Unsubscribe: