bisectable6

query

use nqp; sub foo(--> Bool:D) { nqp::iseq_i((my int $ord = nqp::ord("")), -1) ?? Nil !! True }; my $a; $a := foo for ^2_000; say $a

result

¦«2015.12,2016.01.1,2016.02,2016.03,2016.04,2016.05»:
Invalid string index: max -1, got 0
  in sub foo at /tmp/intx9rA2Uk line 1
  in block  at /tmp/intx9rA2Uk line 1

 «exit code = 1»
¦«2016.06,2016.07.1,2016.08.1,2016.09,2016.10,2016.11,2016.12,2017.01,
  2017.02,2017.03,2017.04.3,2017.05,2017.08,2017.09,2017.10,2017.11,
  2017.12,2018.01,2018.02.1,2018.03,2018.04.1,2018.05,2018.06,2019.03.1,
  2019.07.1,2019.11,2020.01,2020.02.1,2020.05.1,2020.06,2020.07,2020.08.2,
  2020.09,2020.10,2020.11,2020.12,2021.02.1,2021.03,HEAD(a26ff40)»:
Nil

¦«2017.06,2017.07»:
Invalid string index: max -1, got 0
  in sub foo at /tmp/intx9rA2Uk line 1
  in block <unit> at /tmp/intx9rA2Uk line 1

 «exit code = 1»
¦«2016.06,2016.07.1,2016.08.1,2016.09,2016.10,2016.11,2016.12,2017.01,
  2017.02,2017.03,2017.04.3,2017.05,2017.08,2017.09,2017.10,2017.11,
  2017.12,2018.01,2018.02.1,2018.03,2018.04.1,2018.05,2018.06,2019.03.1,
  2019.07.1,2019.11,2020.01,2020.02.1,2020.05.1,2020.06,2020.07,2020.08.2,
  2020.09,2020.10,2020.11,2020.12,2021.02.1,2021.03,HEAD(a26ff40)»:
Nil

¦«2018.08,2018.09,2018.10,2018.11,2018.12»:
True

¦«2016.06,2016.07.1,2016.08.1,2016.09,2016.10,2016.11,2016.12,2017.01,
  2017.02,2017.03,2017.04.3,2017.05,2017.08,2017.09,2017.10,2017.11,
  2017.12,2018.01,2018.02.1,2018.03,2018.04.1,2018.05,2018.06,2019.03.1,
  2019.07.1,2019.11,2020.01,2020.02.1,2020.05.1,2020.06,2020.07,2020.08.2,
  2020.09,2020.10,2020.11,2020.12,2021.02.1,2021.03,HEAD(a26ff40)»:
Nil