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);
}
[AUTO-GENERATED] Migrate ui tests from `//` to `//@` directives 2024-02-16 20:02:50 +00:00			`//@ run-fail`
			`//@ 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`
[AUTO-GENERATED] Migrate ui tests from `//` to `//@` directives 2024-02-16 20:02:50 +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			`}`