Unknown warning :record_match

[rlipscombe]

Environment

• Elixir & Erlang/OTP versions (elixir --version): 1.12.3 / OTP-24.0.6
• Which version of Dialyxir are you using? (cat mix.lock | grep dialyxir): 1.1.0

Current behavior

Unknown warning:
:record_match


Legacy warning:
src/my_module.erl:321:1: Matching of pattern <_Req = {'foo', _, _, _, _, 'undefined', _, _}, _State> tagged with a record name violates the declared type of <#bar{},#state{state::#pending{baz::binary(),quux::integer()},common::#common{peer::{_,_}}}>

[jeremyjh]

It looks like this is not a new warning in dialyzer, but might be one that is not possible to generate in Elixir code. I'm wondering what the best way to handle that would be? I'm tempted to say that we should always print the "legacy" warning when a warning is generated in a .erl file because reformatting all the Erlang terms as Elixir doesn't make any sense for those warnings.

[rlipscombe]

Honestly, we're building an entirely-Erlang project using mix (because reasons), so if the answer is just "use the legacy formatter", I could live with that.

If we were actually doing a mixed-language project, then your suggestion is the better one, I think.