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Diffstat (limited to 'src/tools/clippy/src/docs/cast_possible_wrap.txt')
| -rw-r--r-- | src/tools/clippy/src/docs/cast_possible_wrap.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/tools/clippy/src/docs/cast_possible_wrap.txt b/src/tools/clippy/src/docs/cast_possible_wrap.txt new file mode 100644 index 000000000..f883fc9cf --- /dev/null +++ b/src/tools/clippy/src/docs/cast_possible_wrap.txt @@ -0,0 +1,17 @@ +### What it does +Checks for casts from an unsigned type to a signed type of +the same size. Performing such a cast is a 'no-op' for the compiler, +i.e., nothing is changed at the bit level, and the binary representation of +the value is reinterpreted. This can cause wrapping if the value is too big +for the target signed type. However, the cast works as defined, so this lint +is `Allow` by default. + +### Why is this bad? +While such a cast is not bad in itself, the results can +be surprising when this is not the intended behavior, as demonstrated by the +example below. + +### Example +``` +u32::MAX as i32; // will yield a value of `-1` +```
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