TruffleRuby doesn't print warnings for ininitialized variables

[gogainda]

test.rb:

def undef
  puts "undef", $undefined
end
send(:undef)

Run: ruby -w test.rb

Expected output:

warning: global variable `$undefined' not initialized

[eregon]

Does it cause any compatibility issue in practice?
This might not be worth the implementation effort otherwise.

[eregon]

Actually we already track if they are defined/have been assigned, so it seems easier than I thought.

[eregon]

It seems used in RSpec tests

[andrykonchin]

Fixed in 9b53501, thank you for the report.