Ruby Keyword: __LINE__ - rking/pry-docmore GitHub Wiki

The code's current line number. Can be a handy way to pepper what would otherwise be print "Got here 1" statements in your code, e.g.:

if a
    p __LINE__
    # some stuff
else
    p __LINE__
    # some other stuff
end

…but you use the pry-debugger gem instead, don't you?