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This PR adds support for detecting if overflow checks are enabled in similar fashion as debug_assertions are detected.
Possible use-case of this, for example, if we want to use checked integer casts in builds with overflow checks, e.g.
```rust
pub fn cast(val: usize)->u16 {
if cfg!(overflow_checks) {
val.try_into().unwrap()
}
else{
vas as _
}
}
```
Resolves #91130.
Tracking issue: #111466.
13 lines
484 B
Plaintext
13 lines
484 B
Plaintext
error[E0658]: `cfg(overflow_checks)` is experimental and subject to change
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--> $DIR/feature-gate-cfg_overflow_checks.rs:3:7
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LL | #[cfg(overflow_checks)]
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| ^^^^^^^^^^^^^^^
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= note: see issue #111466 <https://github.com/rust-lang/rust/issues/111466> for more information
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= help: add `#![feature(cfg_overflow_checks)]` to the crate attributes to enable
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0658`.
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