Crabtime doesn't work when Cargo target directory is set to something other than the default

[brady444]

I have my target directory set to rust-target/ in .cargo/config.toml:

[build]
target-dir = "rust-target"

It seems like this breaks Crabtime. With this code:

#[crabtime::function]
fn test() {
    crabtime::output! {
        enum Test {}
    }
}

test!();

I get an error like "Path ... does not have parent 'target' directory.".

If I use the default target/ folder, then it works.

[epage]

Another failure case:

[build]
build-dir = "{cargo-cache-home}/build/{workspace-path-hash}"

Note: Cargo is considering making this the default, see rust-lang/cargo#16147