Recently, I’m working on a Elixir OTP 26 project. When I typed in the command `mix deps.get`, I got this error message: ** (FunctionClauseError) no function clause matching in String.Chars.Hex.Solver.Constraints.Range."-inlined-__impl__/1-"/1 The following arguments were given to Stri…

That’s code (a protocol implementation) by hex, not elixir itself: https://github.com/hexpm/hex/blob/37a28bb221b89f8bdb792b478563282bdaecce0e/lib/hex/solver/constraints/range.ex#L431-L433 You could try downgrading hex using mix local.hex [version]

Thank you so much! I downgraded hex from 2.2.2 to 2.2.1, and the error is gone.

Issue reported. But it’s strange that the said file has not been changed from v2.2.1 to v2.2.2.

Elixir Programming Language Forum

FunctionClauseError on mix deps.get

Questions & Help Questions

LostKobrakai September 2, 2025, 7:46am 4

Please also report the issue, so it can be fixed.