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pub fn sanitize(v: &str) -> (bool, String) {
    match v {
        "as" |
        "break" |
        "const" |
        "continue" |
        "crate" |
        "else" |
        "enum" |
        "extern" |
        "false" |
        "fn" |
        "for" |
        "if" |
        "impl" |
        "in" |
        "let" |
        "loop" |
        "match" |
        "mod" |
        "move" |
        "mut" |
        "pub" |
        "ref" |
        "return" |
        "self" |
        "Self" |
        "static" |
        "struct" |
        "super" |
        "trait" |
        "true" |
        "type" |
        "unsafe" |
        "use" |
        "where" |
        "while" |
        "async" |
        "await" |
        "dyn" |
        "abstract" |
        "become" |
        "box" |
        "do" |
        "final" |
        "macro" |
        "override" |
        "priv" |
        "typeof" |
        "unsized" |
        "virtual" |
        "yield" |
        "try" => (
            true,
            format!("{}_", v),
        ),
        s => (false, s.into()),
    }
}