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evanw/rust-wtf.rs

Created April 1, 2018 02:33
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Rust's float parser has correctness issues
Raw
rust-wtf.rs
fn main() {
// Ok(0.000000000...0000000005)
println!("{:?}", "4.9406564584124654e-324".parse::<f64>());
// WTF???
// Err(ParseFloatError { kind: Invalid })
println!("{:?}", "4.94065645841246545e-324".parse::<f64>());
// Ok(0.000000000...0000000005)
println!("{:?}", "4.9406564584124655e-324".parse::<f64>());
}
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