Function resolve_executable_with_path 

pub fn resolve_executable_with_path<I, P>(
    program: &OsStr,
    path_entries: I,
) -> Result<PathBuf>
where
    I: IntoIterator<Item = P>,
    P: AsRef<Path>,

Resolve a host executable using an injected list of PATH entries.

Empty and relative entries are ignored deliberately: an empty entry means the current directory, and a relative entry would be interpreted relative to whatever directory the child eventually receives. Callers therefore cannot accidentally validate one launcher and execute a workspace shadow.