Bug #20741: RubyVM::InstructionSequence.compile emits a wrong warning (prism?)

• Status: Closed
• Assignee: kddnewton (Kevin Newton)
• Target version: -
• Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN

[mame (Yusuke Endoh)]

$ ./local/bin/ruby -we 'p RubyVM::InstructionSequence.compile("42").eval'
<compiled>:1: warning: possibly useless use of a literal in void context
42

[byroot (Jean Boussier)]

prism?

Yes:

$ ./miniruby --parser=parse.y -we 'p RubyVM::InstructionSequence.compile("42").eval'
42
$ ./miniruby --parser=prism -we 'p RubyVM::InstructionSequence.compile("42").eval'
<compiled>:1: warning: possibly useless use of a literal in void context
42

[kddnewton (Kevin Newton)]

I have submitted a PR that will fix this https://github.com/ruby/ruby/pull/11632.

[kddnewton (Kevin Newton)]

• Status changed from Open to Closed