Issue #20749 has been updated by luke-gru (Luke Gruber). This was an issue with the error_highlight gem. I made a PR here: https://github.com/ruby/error_highlight/pull/48 ---------------------------------------- Bug #20749: Error message not shown in output with prism https://bugs.ruby-lang.org/issues/20749#change-109820 * Author: luke-gru (Luke Gruber) * Status: Open * ruby -v: 3.4.0dev * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- test.rb: ```ruby p = Proc.new ``` ``` ./ruby --parser=parse.y -I../ruby/lib -I. -I.ext/x86_64-linux -I.ext/common -r./x86_64-linux-fake ../ruby/test.rb ../ruby/test.rb:1:in 'Proc.new': tried to create Proc object without a block (ArgumentError) from ../ruby/test.rb:1:in '<main>' ``` ``` ./ruby --parser=prism -I../ruby/lib -I. -I.ext/x86_64-linux -I.ext/common -r./x86_64-linux-fake ../ruby/test.rb ../ruby/test.rb:1:in 'Proc.new': ArgumentError from ../ruby/test.rb:1:in '<main>' ``` -- https://bugs.ruby-lang.org/