Support .nextest.toml config

[heroin-moose]

Motivation

The situation with rust tooling is weird wrt to configuration file locations. We have a bunch of tools (cargo, rustfmt, clippy, nextest) and the configuration layout looks like this:

.cargo/config.toml
.config/nextest.toml
.clippy.toml
.rustfmt.toml

While clippy and rustfmt follow the usual convention, cargo and nextest use subdirs with contradicting approaches: cargo has it all for itself, while nextest creates XDG-like layout. The thing is that basically no other tool does that, leaving .config exclusively for nextest 99% of the time. It makes things confusing.

Proposal

Support having .nextest.toml as the last option for those of us who don't use any other tool that uses .config.

Alternatives

No response

Additional context

No response

[sunshowers]

Thanks for the request. This is a deliberate decision — all tools should be using .config to avoid cluttering the directory. (File bugs with those tools instead?)

https://jrhawley.ca/2025/12/07/xdg-spec-for-repos
https://dot-config.github.io/

Not supporting alternative paths is a way to make the .config style more widespread, so the incremental cost for the next tool to adopt it is that much lower.

[heroin-moose]

Maybe an environment variable then? There is a --config option for what it's worth.

[sunshowers]

Repository configuration is repo-scoped so I don't think an environment variable would be appropriate. There's no real use case for that that I can think of.