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Split out hoisting/printing of box patterns

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This commit is contained in:
Zalathar 2024-08-01 20:29:06 +10:00
parent 7f48851416
commit a5ed6fb646
2 changed files with 10 additions and 7 deletions
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11
compiler/rustc_pattern_analysis/src/rustc.rs
View File

@ -833,6 +833,11 @@ fn hoist_witness_pat(&self, pat: &WitnessPat<'p, 'tcx>) -> print::Pat<'tcx> {
let kind = match pat.ctor() {
Bool(b) => PatKind::Constant { value: mir::Const::from_bool(cx.tcx, *b) },
IntRange(range) => return self.hoist_pat_range(range, *pat.ty()),
Struct if pat.ty().is_box() => {
// Outside of the `alloc` crate, the only way to create a struct pattern
// of type `Box` is to use a `box` pattern via #[feature(box_patterns)].
PatKind::Box { subpattern: hoist(&pat.fields[0]) }
}
Struct | Variant(_) | UnionField => match pat.ty().kind() {
ty::Tuple(..) => PatKind::StructLike {
enum_info: EnumInfo::NotEnum,
@ -841,12 +846,6 @@ fn hoist_witness_pat(&self, pat: &WitnessPat<'p, 'tcx>) -> print::Pat<'tcx> {
.map(|(i, pattern)| FieldPat { field: FieldIdx::new(i), pattern })
.collect(),
},
ty::Adt(adt_def, _) if adt_def.is_box() => {
// Without `box_patterns`, the only legal pattern of type `Box` is `_` (outside
// of `std`). So this branch is only reachable when the feature is enabled and
// the pattern is a box pattern.
PatKind::Deref { subpattern: subpatterns.next().unwrap() }
}
&ty::Adt(adt_def, _) => {
let variant_index = RustcPatCtxt::variant_index_for_adt(&pat.ctor(), adt_def);
let subpatterns = subpatterns

6
compiler/rustc_pattern_analysis/src/rustc/print.rs
View File

@ -38,6 +38,10 @@ pub(crate) enum PatKind<'tcx> {
subpatterns: Vec<FieldPat<'tcx>>,
},
Box {
subpattern: Box<Pat<'tcx>>,
},
Deref {
subpattern: Box<Pat<'tcx>>,
},
@ -64,6 +68,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self.kind {
PatKind::Wild => write!(f, "_"),
PatKind::Never => write!(f, "!"),
PatKind::Box { ref subpattern } => write!(f, "box {subpattern}"),
PatKind::StructLike { ref enum_info, ref subpatterns } => {
write_struct_like(f, self.ty, enum_info, subpatterns)
}
@ -184,7 +189,6 @@ fn write_ref_like<'tcx>(
subpattern: &Pat<'tcx>,
) -> fmt::Result {
match ty.kind() {
ty::Adt(def, _) if def.is_box() => write!(f, "box ")?,
ty::Ref(_, _, mutbl) => {
write!(f, "&{}", mutbl.prefix_str())?;
}