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$ perl -Mstrict -Mwarnings -le '
    use Getopt::Long;
...
test a
test b
test c

$ perl -Mstrict -Mwarnings -le '
    ...
' -- --test 'a b'
--test requires 3 values. Got: a b

$ perl -Mstrict -Mwarnings -le '
    ...
' -- --test 'a b c d'
--test requires 3 values. Got: a b c d

$ perl -Mstrict -Mwarnings -E '
    use Getopt::Long;
...
2: >>>b<<<
3: >>>test<<<
3: >>>c<<<