Bug #18966: Strange behavior when numbered parameters and method definition are both used in a block

• Status: Open
• Priority: Normal
• Assignee: -
• Target version: -
• ruby -v: ruby 3.2.0dev (2022-08-19T04:20:20Z :detached: 17d0e5bee7) [x86_64-linux]
• Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN

[tompng (tomoya ishida)]

'a'.tap { p _1; def f()=42 } #=> "a"
'a'.tap { p _1; def f(a)=42 } #=> nil
'a'.tap { def f()=42; p _1 } #=> "a"
'a'.tap { def f(a)=42; p _1 } # Syntax Error -:1: ordinary parameter is defined

[fcheung (Frederick Cheung)]

Ruby 3.2.2 exhibits the same behaviour as above but on master ( as of b1f345b1 ) all of these now evaluate to 'a'