bjoernager/rust
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Return range endpoint ascriptions/consts via a &mut Vec

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This commit is contained in:
Zalathar 2025-02-03 14:18:04 +11:00
parent 7de67a16c5
commit 85f4cdc626
1 changed files with 19 additions and 12 deletions
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31
compiler/rustc_mir_build/src/thir/pattern/mod.rs
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@ -155,11 +155,11 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
fn lower_pattern_range_endpoint(
&mut self,
expr: Option<&'tcx hir::PatExpr<'tcx>>,
) -> Result<
(Option<PatRangeBoundary<'tcx>>, Option<Ascription<'tcx>>, Option<LocalDefId>),
ErrorGuaranteed,
> {
let Some(expr) = expr else { return Ok((None, None, None)) };
// Out-parameters collecting extra data to be reapplied by the caller
ascriptions: &mut Vec<Ascription<'tcx>>,
inline_consts: &mut Vec<LocalDefId>,
) -> Result<Option<PatRangeBoundary<'tcx>>, ErrorGuaranteed> {
let Some(expr) = expr else { return Ok(None) };
let (kind, ascr, inline_const) = match self.lower_lit(expr) {
PatKind::ExpandedConstant { subpattern, def_id, is_inline: true } => {
@ -187,7 +187,10 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
return Err(self.tcx.dcx().span_delayed_bug(expr.span, msg));
}
};
Ok((Some(PatRangeBoundary::Finite(value)), ascr, inline_const))
ascriptions.extend(ascr);
inline_consts.extend(inline_const);
Ok(Some(PatRangeBoundary::Finite(value)))
}
/// Overflowing literals are linted against in a late pass. This is mostly fine, except when we
@ -250,11 +253,15 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
self.tcx.dcx().span_bug(span, msg);
}
let (lo, lo_ascr, lo_inline) = self.lower_pattern_range_endpoint(lo_expr)?;
let (hi, hi_ascr, hi_inline) = self.lower_pattern_range_endpoint(hi_expr)?;
// Collect extra data while lowering the endpoints, to be reapplied later.
let mut ascriptions = vec![];
let mut inline_consts = vec![];
let lo = lo.unwrap_or(PatRangeBoundary::NegInfinity);
let hi = hi.unwrap_or(PatRangeBoundary::PosInfinity);
let mut lower_endpoint =
|expr| self.lower_pattern_range_endpoint(expr, &mut ascriptions, &mut inline_consts);
let lo = lower_endpoint(lo_expr)?.unwrap_or(PatRangeBoundary::NegInfinity);
let hi = lower_endpoint(hi_expr)?.unwrap_or(PatRangeBoundary::PosInfinity);
let cmp = lo.compare_with(hi, ty, self.tcx, self.typing_env);
let mut kind = PatKind::Range(Box::new(PatRange { lo, hi, end, ty }));
@ -295,13 +302,13 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
// If we are handling a range with associated constants (e.g.
// `Foo::<'a>::A..=Foo::B`), we need to put the ascriptions for the associated
// constants somewhere. Have them on the range pattern.
for ascription in [lo_ascr, hi_ascr].into_iter().flatten() {
for ascription in ascriptions {
kind = PatKind::AscribeUserType {
ascription,
subpattern: Box::new(Pat { span, ty, kind }),
};
}
for def in [lo_inline, hi_inline].into_iter().flatten() {
for def in inline_consts {
kind = PatKind::ExpandedConstant {
def_id: def.to_def_id(),
is_inline: true,