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Hide the end of ranges in pretty printing if it's also the maximum of the type

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This commit is contained in:
Oli Scherer 2025-02-05 16:21:54 +00:00
parent e8f7a382be
commit a2c1211b6d
10 changed files with 50 additions and 28 deletions
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24
compiler/rustc_middle/src/ty/pattern.rs
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@ -27,7 +27,29 @@ impl<'tcx> fmt::Debug for PatternKind<'tcx> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
PatternKind::Range { start, end } => {
write!(f, "{start}..={end}")
write!(f, "{start}")?;
if let Some(c) = end.try_to_value() {
let end = c.valtree.unwrap_leaf();
let size = end.size();
let max = match c.ty.kind() {
ty::Int(_) => {
Some(ty::ScalarInt::truncate_from_int(size.signed_int_max(), size))
}
ty::Uint(_) => {
Some(ty::ScalarInt::truncate_from_uint(size.unsigned_int_max(), size))
}
ty::Char => Some(ty::ScalarInt::truncate_from_uint(char::MAX, size)),
_ => None,
};
if let Some((max, _)) = max
&& end == max
{
return write!(f, "..");
}
}
write!(f, "..={end}")
}
}
}