Issue #22136 has been updated by ufuk (Ufuk Kayserilioglu). Could this be related to https://bugs.ruby-lang.org/issues/22129 ---------------------------------------- Feature #22136: `sprintf` shouldn't raise ArgumentError when $DEBUG is set https://bugs.ruby-lang.org/issues/22136#change-117835 * Author: byroot (Jean Boussier) * Status: Open ---------------------------------------- ### Expected behavior If I'm tracking down a problem and suspect an error might be swallowed somewhere, I do run my test case with `RUBYOPT="-d"` (or simply set `$DEBUG = true`. I do expect the program to execute all in the same way than without `-d`, expect for extra output on STDERR. ### Actual behavior If some code happens to call `sprintf` or `String#%` with too many arguments, then it will raise an error and likely break the program, preventing me from simply running the same code but in debug mode. ### Reproduction ``` $ ruby -e 'sprintf("foo", "bar"); p :ok' :ok $ ruby -We 'sprintf("foo", "bar"); p :ok' -e:1: warning: too many arguments for format string :ok $ ruby -dWe 'sprintf("foo", "bar"); p :ok' Exception 'LoadError' at .../lib/ruby/4.0.0/rubygems.rb:1423 - cannot load such file -- rubygems/defaults/operating_system Exception 'LoadError' at .../lib/ruby/4.0.0/rubygems.rb:1438 - cannot load such file -- rubygems/defaults/ruby Exception 'ArgumentError' at -e:1 - too many arguments for format string Exception 'RuntimeError' at <internal:ast>:96 - cannot get AST for ISEQ compiled by prism -e:1:in 'Kernel#sprintf': too many arguments for format string (ArgumentError) from -e:1:in '<main>' ``` ### Bug or Feature? I looked around the Ruby codebase, as far as I can tell this is the only method behaving this way (aside from its aliases like `String#%`). So I filed this as a Feature, but really in my opinion it is a bug. Pull Request: https://github.com/ruby/ruby/pull/17579 -- https://bugs.ruby-lang.org/