{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
    // That would force `cg_gcc` to *rebuild itself* and only then run tests, which is undesirable.
    // We don't want to pass things like `RUSTFLAGS`, since they contain the -Zcodegen-backend flag.
    let mut env = HashMap::new();