rust/tests/ui/numbers-arithmetic/overflowing-sub.rs

//@ run-fail
//@ error-pattern:thread 'main' panicked
//@ error-pattern:attempt to subtract with overflow
//@ needs-subprocess
//@ compile-flags: -C debug-assertions

#![allow(arithmetic_overflow)]

fn main() {
    let _x = 42u8 - (42u8 + 1);
}
Move tests from `test/run-fail` to UI 2020-04-16 06:50:32 +00:00			`//@ run-fail`
Change default panic handler message format. 2023-06-20 17:16:18 +00:00			`//@ error-pattern:thread 'main' panicked`
			`//@ error-pattern:attempt to subtract with overflow`
tests: use `needs-subprocess` instead of `ignore-{wasm32,emscripten,sgx}` 2025-01-23 08:36:54 +00:00			`//@ needs-subprocess`
rustc: Add a debug_assertions #[cfg] directive This commit is an implementation of [RFC 563][rfc] which adds a new `cfg(debug_assertions)` directive which is specially recognized and calculated by the compiler. The flag is turned off at any optimization level greater than 1 and may also be explicitly controlled through the `-C debug-assertions` flag. [rfc]: https://github.com/rust-lang/rfcs/pull/563 The `debug_assert!` and `debug_assert_eq!` macros now respect this instead of the `ndebug` variable and `ndebug` no longer holds any meaning to the standard library. Code which was previously relying on `not(ndebug)` to gate expensive code should be updated to rely on `debug_assertions` instead. Closes #22492 [breaking-change] 2015-03-02 22:51:24 +00:00			`//@ compile-flags: -C debug-assertions`
Fix the overflowing tests in run-fail. * The error patterns had a typo. * Our current constant evaluation would silently allow the overflow (filed as Issue 22531). * The overflowing-mul test was accidentally doing addition instead of multiplication. 2015-02-19 11:37:27 +00:00
better lint names 2020-02-18 21:49:47 +00:00			`#![allow(arithmetic_overflow)]`
Make the `const_err` lint `deny`-by-default 2018-05-11 12:33:37 +00:00
rustc: implement arithmetic overflow checking Adds overflow checking to integer addition, multiplication, and subtraction when `-Z force-overflow-checks` is true, or if `--cfg ndebug` is not passed to the compiler. On overflow, it panics with `arithmetic operation overflowed`. Also adds `overflowing_add`, `overflowing_sub`, and `overflowing_mul` intrinsics for doing unchecked arithmetic. [breaking-change] 2015-01-06 05:56:30 +00:00			`fn main() {`
implement RFC 1229 const eval errors outside of true constant enviroments are not reported anymore, but instead forwarded to a lint. 2015-10-02 08:36:45 +00:00			`let _x = 42u8 - (42u8 + 1);`
rustc: implement arithmetic overflow checking Adds overflow checking to integer addition, multiplication, and subtraction when `-Z force-overflow-checks` is true, or if `--cfg ndebug` is not passed to the compiler. On overflow, it panics with `arithmetic operation overflowed`. Also adds `overflowing_add`, `overflowing_sub`, and `overflowing_mul` intrinsics for doing unchecked arithmetic. [breaking-change] 2015-01-06 05:56:30 +00:00			`}`