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A comment on Cross-platform Rust rewrite of the GNU coreutils. Parent comment

Re:Cross-platform Rust rewrite of the GNU coreutils by jstimpfle on Tuesday March 22, 2016 @06:27PM (#11340432)
> If the requested behaviour is unspecified (just `a+b`), overflows cause runtime panic.

As far as I know most machines can't trap on signed integer overflow. Which means having runtime panic is not practical. The page you linked says "no checking by default for optimized builds".

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Re:Cross-platform Rust rewrite of the GNU coreutils by viraptor on Tuesday March 22, 2016 @06:41PM (#11340511)
Ok, I simplified this too much. For full details of what happens you'll have to read the docs.

The non-release mode panics. Release mode with debug asserts turned on panics. Release mode with forced overflow checks panics. Release mode with no special options results in the same result as a wrapping operation.

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