How to rerun test with TRYBUILD=overwrite?

Question

I want to rerun a test inside frame-support and overwrite the .stderr file with the actual error. The CI checks give me the instruction to rerun the test with the environment variable TRYBUILD=overwrite, but how do I do that? I tried to set the env variable in the Cargo.toml file like:

[env]
TRYBUILD = "overwrite"

but this doesn't work.

Answer 1

There is a script in the Substrate repo which you can use to update the pallet UI tests.
You can call it like this:

.maintain/update-rust-stable.sh 1.62

with the Rust version that you want to use.
This should set all env variables, thanks to @bkchr.