Do not unconditionally succeed RUSTC_WRAPPER checks when run by build scripts by...

I tested this on two workspaces that exhibit the problem reported with anyhow, and in both cases the issue is fixed (and no obvious regressions)

Thank you for testing! There shouldn't be any regressions caused due to this (unless cargo sets this env var in other occasions which it shouldn't)
@bors r+

Commit 72ae308 has been approved by Veykril

It is now in the queue for this repository.

Testing commit 72ae308 with merge 5941dec...

Test successful - checks-actions
Approved by: Veykril
Pushing 5941dec to master...

This seems to cause unnecessary rebuilds, it seems. Some crate that depends on anyhow here will always rebuild anyhow and some other crates every time I run cargo build after saving in vim/coc-rust-analyzer. That wasn't the case before.

this is only invoked on startup for rust-analyzer, so this cannot have changed the behavior for when you save

Hrm, then something else must've changed between this and last Monday's release. Sorry for the noise here then.

The only recent relevant change I could think of is #12808, but that is 2 releases ago, not one

This seems to cause unnecessary rebuilds, it seems. Some crate that depends on anyhow here will always rebuild anyhow and some other crates every time I run cargo build after saving in vim/coc-rust-analyzer. That wasn't the case before.

You might be hitting this issue.

Thanks, that seems to have fixed this