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Clarify impl Map for !.

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All the methods are unreachable, so make that clearer.
This commit is contained in:
Nicholas Nethercote 2025-02-03 15:29:12 +11:00
parent 7ff67901ac
commit b51ab7d9be
1 changed files with 7 additions and 7 deletions
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14
compiler/rustc_hir/src/intravisit.rs
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@ -121,25 +121,25 @@ pub trait Map<'hir> {
// Used when no map is actually available, forcing manual implementation of nested visitors.
impl<'hir> Map<'hir> for ! {
fn hir_node(&self, _: HirId) -> Node<'hir> {
*self;
unreachable!();
}
fn hir_node_by_def_id(&self, _: LocalDefId) -> Node<'hir> {
*self;
}
fn body(&self, _: BodyId) -> &'hir Body<'hir> {
*self;
unreachable!();
}
fn item(&self, _: ItemId) -> &'hir Item<'hir> {
*self;
unreachable!();
}
fn trait_item(&self, _: TraitItemId) -> &'hir TraitItem<'hir> {
*self;
unreachable!();
}
fn impl_item(&self, _: ImplItemId) -> &'hir ImplItem<'hir> {
*self;
unreachable!();
}
fn foreign_item(&self, _: ForeignItemId) -> &'hir ForeignItem<'hir> {
*self;
unreachable!();
}
}
@ -203,7 +203,7 @@ use nested_filter::NestedFilter;
/// to monitor future changes to `Visitor` in case a new method with a
/// new default implementation gets introduced.)
pub trait Visitor<'v>: Sized {
// this type should not be overridden, it exists for convenient usage as `Self::Map`
// This type should not be overridden, it exists for convenient usage as `Self::Map`.
type Map: Map<'v> = <Self::NestedFilter as NestedFilter<'v>>::Map;
///////////////////////////////////////////////////////////////////////////