Strange error in implicit return of match variable #3104
Description
In some cases implicitly returned match variables ($1) are being incorrectly returned as nil. Using an explicit return fixes the issue. This was seen on jruby 9.0.0.0.rc1.
Here is a simple script that reproduces the issue:
[gscott@dev tmp]$ jruby --version
jruby 9.0.0.0.rc1 (2.2.2) 2015-06-10 a0bf3b3 Java HotSpot(TM) 64-Bit Server VM 25.45-b02 on 1.8.0_45-b14 +jit [linux-amd64]
[gscott@dev tmp]$ cat test.rb
def parse_char_with_return(string)
if string =~ /Prefix (\w)/
puts "++> parse_char_with_return(#{string}) = #{$1}"
return $1
end
end
def parse_char_wo_return(string)
if string =~ /Prefix (\w)/
puts "++> parse_char_wo_return(#{string}) = #{$1}"
$1
end
end
ret = parse_char_with_return("Prefix A")
puts "==> parse_char_with_return(Prefix A) = #{ret.inspect}"
raise(Exception, 'Failed to return correct value') if ret.nil?
puts ''
ret = parse_char_wo_return("Prefix A")
puts "==> parse_char_wo_return(Prefix A) = #{ret.inspect}"
[gscott@dev tmp]$ jruby test.rb
++> parse_char_with_return(Prefix A) = A
==> parse_char_with_return(Prefix A) = "A"
++> parse_char_wo_return(Prefix A) = A
==> parse_char_wo_return(Prefix A) = nil
Both parse_char_with_return and parse_char_wo_return should return "A" but the latter returns nil as shown above.