bjoernager/rust
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implement unstable new_range feature

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for RFC 3550, tracking issue #123741
This commit is contained in:
Peter Jaszkowiak 2025-01-27 13:32:10 -07:00
parent 95eaadc773
commit f530a29944
15 changed files with 210 additions and 14 deletions
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35
compiler/rustc_ast_lowering/src/expr.rs
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@ -284,9 +284,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
ExprKind::Index(el, er, brackets_span) => {
hir::ExprKind::Index(self.lower_expr(el), self.lower_expr(er), *brackets_span)
}
ExprKind::Range(Some(e1), Some(e2), RangeLimits::Closed) => {
self.lower_expr_range_closed(e.span, e1, e2)
}
ExprKind::Range(e1, e2, lims) => {
self.lower_expr_range(e.span, e1.as_deref(), e2.as_deref(), *lims)
}
@ -1512,15 +1509,39 @@ impl<'hir> LoweringContext<'_, 'hir> {
let lang_item = match (e1, e2, lims) {
(None, None, HalfOpen) => hir::LangItem::RangeFull,
(Some(..), None, HalfOpen) => hir::LangItem::RangeFrom,
(Some(..), None, HalfOpen) => {
if self.tcx.features().new_range() {
hir::LangItem::RangeFromCopy
} else {
hir::LangItem::RangeFrom
}
}
(None, Some(..), HalfOpen) => hir::LangItem::RangeTo,
(Some(..), Some(..), HalfOpen) => hir::LangItem::Range,
(Some(..), Some(..), HalfOpen) => {
if self.tcx.features().new_range() {
hir::LangItem::RangeCopy
} else {
hir::LangItem::Range
}
}
(None, Some(..), Closed) => hir::LangItem::RangeToInclusive,
(Some(..), Some(..), Closed) => unreachable!(),
(Some(e1), Some(e2), Closed) => {
if self.tcx.features().new_range() {
hir::LangItem::RangeInclusiveCopy
} else {
return self.lower_expr_range_closed(span, e1, e2);
}
}
(start, None, Closed) => {
self.dcx().emit_err(InclusiveRangeWithNoEnd { span });
match start {
Some(..) => hir::LangItem::RangeFrom,
Some(..) => {
if self.tcx.features().new_range() {
hir::LangItem::RangeFromCopy
} else {
hir::LangItem::RangeFrom
}
}
None => hir::LangItem::RangeFull,
}
}