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Fix cast_lossless to avoid warning on usize to f64 conversion. #8778

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May 6, 2022
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Fix cast_lossless to avoid warning on usize to f64 conversion. #8778

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2 changes: 1 addition & 1 deletion clippy_lints/src/casts/cast_lossless.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,7 @@ fn should_lint(
} else {
64
};
from_nbits < to_nbits
!is_isize_or_usize(cast_from) && from_nbits < to_nbits
},
(false, true) if matches!(cast_from.kind(), ty::Bool) && meets_msrv(msrv.as_ref(), &msrvs::FROM_BOOL) => true,
(_, _) => {
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14 changes: 0 additions & 14 deletions tests/ui/cast_size_32bit.stderr
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Expand Up @@ -14,26 +14,12 @@ LL | x0 as f64;
|
= note: `-D clippy::cast-precision-loss` implied by `-D warnings`

error: casting `isize` to `f64` may become silently lossy if you later change the type
--> $DIR/cast_size_32bit.rs:15:5
|
LL | x0 as f64;
| ^^^^^^^^^ help: try: `f64::from(x0)`
|
= note: `-D clippy::cast-lossless` implied by `-D warnings`

error: casting `usize` to `f64` causes a loss of precision on targets with 64-bit wide pointers (`usize` is 64 bits wide, but `f64`'s mantissa is only 52 bits wide)
--> $DIR/cast_size_32bit.rs:16:5
|
LL | x1 as f64;
| ^^^^^^^^^

error: casting `usize` to `f64` may become silently lossy if you later change the type
--> $DIR/cast_size_32bit.rs:16:5
|
LL | x1 as f64;
| ^^^^^^^^^ help: try: `f64::from(x1)`

error: casting `isize` to `f32` causes a loss of precision (`isize` is 32 or 64 bits wide, but `f32`'s mantissa is only 23 bits wide)
--> $DIR/cast_size_32bit.rs:17:5
|
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