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add clarification on overflowing_literals lint #1970

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Nov 3, 2025
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add clarification on overflowing_literals lint #1970

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5 changes: 3 additions & 2 deletions src/types/cast.md
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ except in cases where C has undefined behavior. The behavior of all casts
between integral types is well defined in Rust.

```rust,editable,ignore,mdbook-runnable
// Suppress all warnings from casts which overflow.
// Suppress all errors from casts which overflow.
#![allow(overflowing_literals)]

fn main() {
Expand All @@ -31,7 +31,8 @@ fn main() {

// when casting any value to an unsigned type, T,
// T::MAX + 1 is added or subtracted until the value
// fits into the new type
// fits into the new type ONLY when the #![allow(overflowing_literals)]
// lint is specified like above. Otherwise there will be a compiler error.

// 1000 already fits in a u16
println!("1000 as a u16 is: {}", 1000 as u16);
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