FunctionClauseError on mix deps.get

Questions / Help
1

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 String.Chars.Hex.Solver.Constraints.Range."-inlined-__impl__/1-"/1:
    
        # 1
        :target
    
    (hex 2.2.2) String.Chars.Hex.Solver.Constraints.Range."-inlined-__impl__/1-"/1
    (elixir 1.15.7) lib/string/chars.ex:3: String.Chars.impl_for/1
    (elixir 1.15.7) lib/string/chars.ex:3: String.Chars.impl_for!/1
    (elixir 1.15.7) lib/string/chars.ex:22: String.Chars.to_string/1
    (hex 2.2.2) lib/hex/mix.ex:205: Hex.Mix.registry_dep_to_def/1
    (elixir 1.15.7) lib/enum.ex:1693: Enum."-map/2-lists^map/1-1-"/2
    (hex 2.2.2) lib/hex/mix.ex:157: anonymous fn/1 in Hex.Mix.to_lock/1
    (elixir 1.15.7) lib/enum.ex:1693: Enum."-map/2-lists^map/1-1-"/2

I can’t upgrade Erlang and Elixir to OTP 27 or higher because of the `:amqp` lib that constantly throws errors on higher OTP version.

This error is thrown even after I completely deleted the _build and the deps folders. Any help?

OS: Pop!_OS 22.04

Elixir: 1.15.7-otp-26

Erlang: 26.2.5.12

2

That’s code (a protocol implementation) by hex, not elixir itself:

You could try downgrading hex using mix local.hex [version]

1 Like
3

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

4

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

5

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