Can't access resources outside of the target folder

[patmuk]

I have a proc-macro, which loads a file from a given location to generate code.
I call it this way:

#[generate_api("tests/good_source_file/mod.rs")]
impl Lifecycle for LifecycleImpl {

Using try build the given file can't be found, because "cwd" and "CARGO_TARGET_DIR" are redirected to $DIR/target/tests/trybuild.

Is there anyway I can change that?
I don't want to hardcode a full path - the macro assumes the file's location is relative to the project's root directory.

Needless to say, outside of trybuild::TestCases::new().pass("tests/ui_tests.rs"); the file loading works.

[addisoncrump]

Seconding this, I need a resource adjacent to my test. I ended up using ../../../../<path/from/workspace> to access this, but this is probably not stable and is a bit gross.