Issue #20788 has been reported by jeremyevans0 (Jeremy Evans). ---------------------------------------- Bug #20788: Prism issues unused variable warnings for negative line numbers https://bugs.ruby-lang.org/issues/20788 * Author: jeremyevans0 (Jeremy Evans) * Status: Open * Assignee: kddnewton (Kevin Newton) * Backport: 3.1: DONTNEED, 3.2: DONTNEED, 3.3: DONTNEED ---------------------------------------- parse.y does not issue unused variable warnings for negative line numbers. However, prism does issue such warnings. Example code: ```ruby Object.class_eval(<<END, nil, -2) def a(locals) foo = locals[:foo] 2 end END ``` Output: ``` $ run_ruby -v --parser=prism --disable-gems t/t82.rb ruby 3.4.0dev (2024-10-08T22:14:44Z master 3fc1495c30) +PRISM [x86_64-openbsd7.6] (eval at t/t82.rb:1):-1: warning: assigned but unused variable - foo $ run_ruby -v --parser=parse.y --disable-gems t/t82.rb ruby 3.4.0dev (2024-10-08T22:14:44Z master 3fc1495c30) [x86_64-openbsd7.6] ``` This results in spurious verbose-mode warnings in applications using tilt, the template library used by most non-Rails web frameworks (Sinatra, Roda, Hanami, Cuba, Camping, etc.). -- https://bugs.ruby-lang.org/