Function cargo::util::toml::targets::target_path_not_found_error_message

fn target_path_not_found_error_message(
    package_root: &Path,
    target: &TomlTarget,
    target_kind: &str
) -> String

Build an error message for a target path that cannot be determined either by auto-discovery or specifying.

This function tries to detect commonly wrong paths for targets:

test -> tests/.rs, tests//main.rs bench -> benches/.rs, benches//main.rs example -> examples/.rs, examples//main.rs bin -> src/bin/.rs, src/bin//main.rs

Note that the logic need to sync with infer_from_directory if changes.