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Integer overflow in nested comment parser when nesting depth exceeds 4 billion #357

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dtolnay opened this issue Oct 15, 2022 · 0 comments · Fixed by #358

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dtolnay commented Oct 15, 2022

fn main() {
    let mut input = "/*".repeat(u32::MAX as usize + 3);
    input.truncate(input.len() - 2);
    input.push_str("*/");
    println!("{}", input.parse::<proc_macro2::TokenStream>().is_ok());
}

This program should print false but it prints true.

dtolnay mentioned this issue

Fix integer overflow in nested comment parser #358

Merged

dtolnay closed this as completed in #358

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