Auto merge of #104048 - cjgillot:split-lifetime, r=compiler-errors

Separate lifetime ident from lifetime resolution in HIR

Drive-by: change how suggested generic args are computed.
Fixes #103815

I recommend reviewing commit-by-commit.

Author: bors

compiler/rustc_ast_lowering/src/expr.rs

@@ -605,6 +605,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
             output,
             c_variadic: false,
             implicit_self: hir::ImplicitSelfKind::None,
+            lifetime_elision_allowed: false,
         });
 
         // Lower the argument pattern/ident. The ident is used again in the `.await` lowering.
@@ -917,7 +918,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
 
         let bound_generic_params = self.lower_lifetime_binder(closure_id, generic_params);
         // Lower outside new scope to preserve `is_in_loop_condition`.
-        let fn_decl = self.lower_fn_decl(decl, None, fn_decl_span, FnDeclKind::Closure, None);
+        let fn_decl = self.lower_fn_decl(decl, closure_id, fn_decl_span, FnDeclKind::Closure, None);
 
         let c = self.arena.alloc(hir::Closure {
             def_id: self.local_def_id(closure_id),
@@ -1027,7 +1028,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
         // have to conserve the state of being inside a loop condition for the
         // closure argument types.
         let fn_decl =
-            self.lower_fn_decl(&outer_decl, None, fn_decl_span, FnDeclKind::Closure, None);
+            self.lower_fn_decl(&outer_decl, closure_id, fn_decl_span, FnDeclKind::Closure, None);
 
         let c = self.arena.alloc(hir::Closure {
             def_id: self.local_def_id(closure_id),

compiler/rustc_ast_lowering/src/index.rs

@@ -303,7 +303,7 @@ impl<'a, 'hir> Visitor<'hir> for NodeCollector<'a, 'hir> {
     }
 
     fn visit_lifetime(&mut self, lifetime: &'hir Lifetime) {
-        self.insert(lifetime.span, lifetime.hir_id, Node::Lifetime(lifetime));
+        self.insert(lifetime.ident.span, lifetime.hir_id, Node::Lifetime(lifetime));
     }
 
     fn visit_variant(&mut self, v: &'hir Variant<'hir>) {