Method without_self_change

src/program/transform.rs:64–70

create a copy and without change self code.

(mut self)

    /// create a copy and without change self code.
    pub fn without_self_change(mut self) -> Self {
        let out_file = self.src_file.with_extension("transform.cc");
        std::fs::copy(&self.src_file, &out_file)
            .unwrap_or_else(|_| panic!("unable to copy {:?} to {:?}", self.src_file, out_file));
        self.src_file = out_file;
        self
    }

    pub fn get_output_file(&self) -> &Path {
        &self.src_file