Rollup merge of #94011 - est31:let_else, r=lcnr

Even more let_else adoptions

Continuation of #89933, #91018, #91481, #93046, #93590.

src/librustdoc/clean/simplify.rs

@@ -51,9 +51,7 @@ crate fn where_clauses(cx: &DocContext<'_>, clauses: Vec<WP>) -> Vec<WP> {
     // Look for equality predicates on associated types that can be merged into
     // general bound predicates
     equalities.retain(|&(ref lhs, ref rhs)| {
-        let (self_, trait_did, name) = if let Some(p) = lhs.projection() {
-            p
-        } else {
+        let Some((self_, trait_did, name)) = lhs.projection() else {
             return true;
         };
         let generic = match self_ {

src/librustdoc/html/markdown.rs

@@ -236,9 +236,7 @@ impl<'a, I: Iterator<Item = Event<'a>>> Iterator for CodeBlocks<'_, 'a, I> {
         let should_panic;
         let ignore;
         let edition;
-        let kind = if let Some(Event::Start(Tag::CodeBlock(kind))) = event {
-            kind
-        } else {
+        let Some(Event::Start(Tag::CodeBlock(kind))) = event else {
             return event;
         };
 

src/librustdoc/html/render/print_item.rs

@@ -1752,9 +1752,7 @@ fn document_type_layout(w: &mut Buffer, cx: &Context<'_>, ty_def_id: DefId) {
                             <ul>",
                     );
 
-                    let adt = if let Adt(adt, _) = ty_layout.ty.kind() {
-                        adt
-                    } else {
+                    let Adt(adt, _) = ty_layout.ty.kind() else {
                         span_bug!(tcx.def_span(ty_def_id), "not an adt")
                     };
 

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -1226,9 +1226,7 @@ impl LinkCollector<'_, '_> {
         let base_node =
             if item.is_mod() && inner_docs { self.mod_ids.last().copied() } else { parent_node };
 
-        let mut module_id = if let Some(id) = base_node {
-            id
-        } else {
+        let Some(mut module_id) = base_node else {
             // This is a bug.
             debug!("attempting to resolve item without parent module: {}", path_str);
             resolution_failure(
@@ -1977,9 +1975,7 @@ fn resolution_failure(
                     // If so, report it and say the first which failed; if not, say the first path segment didn't resolve.
                     let mut name = path_str;
                     'outer: loop {
-                        let (start, end) = if let Some(x) = split(name) {
-                            x
-                        } else {
+                        let Some((start, end)) = split(name) else {
                             // avoid bug that marked [Quux::Z] as missing Z, not Quux
                             if partial_res.is_none() {
                                 *unresolved = name.into();

src/librustdoc/scrape_examples.rs

@@ -152,9 +152,7 @@ where
             }
             hir::ExprKind::MethodCall(_, _, span) => {
                 let types = tcx.typeck(ex.hir_id.owner);
-                let def_id = if let Some(def_id) = types.type_dependent_def_id(ex.hir_id) {
-                    def_id
-                } else {
+                let Some(def_id) = types.type_dependent_def_id(ex.hir_id) else {
                     trace!("type_dependent_def_id({}) = None", ex.hir_id);
                     return;
                 };

src/librustdoc/visit_ast.rs

@@ -188,9 +188,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
         debug!("maybe_inline_local res: {:?}", res);
 
         let tcx = self.cx.tcx;
-        let res_did = if let Some(did) = res.opt_def_id() {
-            did
-        } else {
+        let Some(res_did) = res.opt_def_id() else {
             return false;
         };