Function try_project_options 

pub fn try_project_options(
    input: &Path,
) -> Result<CompileOptions, ProjectOptionsError>

project_options, but a malformed bynk.toml is an error rather than a silent fall-back to the conventional layout — the one input a user hand-edits that the compiler otherwise reads without checking, after which a cascade of bynk.uses.unknown_target errors points at units that plainly exist on disk.