Rollup merge of #82238 - petrochenkov:nocratemod, r=Aaron1011

ast: Keep expansion status for out-of-line module items

I.e. whether a module `mod foo;` is already loaded from a file or not.
This is a pre-requisite to correctly treating inner attributes on such modules (https://github.com/rust-lang/rust/issues/81661).

With this change AST structures for `mod` items diverge even more for AST structure for the crate root, which previously used `ast::Mod`.
Therefore this PR removes `ast::Mod` from `ast::Crate` in the first commit, these two things are sufficiently different from each other, at least at syntactic level.
Customization points for visiting a "`mod` item or crate root" were also removed from AST visitors (`fn visit_mod`).
`ast::Mod` itself was refactored away in the second commit in favor of `ItemKind::Mod(Unsafe, ModKind)`.

1 files changed, 0 insertions, 10 deletions

diff --git a/compiler/rustc_passes/src/hir_stats.rs b/compiler/rustc_passes/src/hir_stats.rs
index 8d5a5bdf6b7..fac28281593 100644
--- a/compiler/rustc_passes/src/hir_stats.rs
+++ b/compiler/rustc_passes/src/hir_stats.rs
@@ -124,11 +124,6 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> {
         hir_visit::walk_item(self, i)
     }
 
-    fn visit_mod(&mut self, m: &'v hir::Mod<'v>, _s: Span, n: hir::HirId) {
-        self.record("Mod", Id::None, m);
-        hir_visit::walk_mod(self, m, n)
-    }
-
     fn visit_foreign_item(&mut self, i: &'v hir::ForeignItem<'v>) {
         self.record("ForeignItem", Id::Node(i.hir_id()), i);
         hir_visit::walk_foreign_item(self, i)
@@ -252,11 +247,6 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> {
 }
 
 impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> {
-    fn visit_mod(&mut self, m: &'v ast::Mod, _s: Span, _a: &[ast::Attribute], _n: NodeId) {
-        self.record("Mod", Id::None, m);
-        ast_visit::walk_mod(self, m)
-    }
-
     fn visit_foreign_item(&mut self, i: &'v ast::ForeignItem) {
         self.record("ForeignItem", Id::None, i);
         ast_visit::walk_foreign_item(self, i)