play.
fn main() {
let _ = f32::from_str_radix("™0.2", 10);
}Expected behaviour
Nothing hapens. The method returns an error with kind Invalid which is ignored.
Observed behaviour
The code panics.
thread 'main' panicked at 'byte index 1 is not a char boundary; it is inside '™' (bytes 0..3) of `™0.2`', src/libcore/str/mod.rs:2034:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
Cause analysis
The underlying cause is that slice_shift_char splits the string at a hardcode byte offset of 1 instead of the byte-length of the first character. This panics when it is not a UTF-8 byte boundary.
|
fn slice_shift_char(src: &str) -> Option<(char, &str)> { |
|
src.chars().nth(0).map(|ch| (ch, &src[1..])) |
|
} |
play.
Expected behaviour
Nothing hapens. The method returns an error with kind
Invalidwhich is ignored.Observed behaviour
The code panics.
Cause analysis
The underlying cause is that
slice_shift_charsplits the string at a hardcode byte offset of1instead of the byte-length of the first character. This panics when it is not a UTF-8 byte boundary.num-traits/src/lib.rs
Lines 218 to 220 in 58f02a8