rakudo/rakudo — pull request #95 by timo (2013-01-19 19:58:20+00:00)
Title: Use Levenshtein to suggest variables/routines/superclasses

my $foo = 10; say $Foo; - "did you mean $foo?"
my @bar = 1,2,3; say $bar[1]; - "did you mean @bar?"
spit("Foo Bar Baz"); - "spit used at line 1. Did you mean '&split'?"
class ExactlyTwo is Junktion { }; - "'ExactlyTwo' cannot inherit from 'Junktion' because it is unknown. Did you mean 'Junction'?"