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Point out that char is 32 bit value

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This commit is contained in:
Florian Hartwig 2016-01-27 21:10:35 +01:00
parent 23dfb2fbc0
commit cee96fab39
1 changed files with 3 additions and 1 deletions
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4
src/types.rs
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@ -544,7 +544,9 @@ impl LateLintPass for CharLitAsU8 {
if let ExprLit(ref l) = e.node {
if let Lit_::LitChar(_) = l.node {
if ty::TyUint(UintTy::TyU8) == cx.tcx.expr_ty(expr).sty && !in_macro(cx, expr.span) {
let msg = "casting character literal to u8.";
let msg = "casting character literal to u8. `char`s \
are 4 bytes wide in rust, so casting to u8 \
truncates them";
let help = format!("Consider using a byte literal \
instead:\nb{}",
snippet(cx, e.span, "'x'"));