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Bug Demonstration

I've found a bug that I can't figure out. This repo is a minimal example to reproduce it. There is a test that repeats the same thing 1000 times and sometimes Regex.split does not properly split the string. I tried to strip the project as much as I can but if I tried to remove anything more, it magically started to work normally.

To reproduce

To test I recommend using bash loop like while mix test; do done. For me it fails every 4-5 runs.

On a failed test, you can see output like this:

STR: "10.00 EUR"
LST: ["10.00", "EUR"]
VALUE: "10.00"
STR: "10.00 EUR"
LST: ["10.00", "EUR"]
VALUE: "10.00"
STR: "10.00 EUR"
LST: ["10.00 EUR"]
VALUE: ""

Last line indicates that at this particular moment Regex.split did not split the string.

Elixir versions

I specified Elixir 1.10.4 and Erlang OTP 23. But it works the same on Elirix 1.11.4 Looks like it disappears in version 1.12.0