Rollup merge of #83415 - camelid:remove-crate-module-option, r=jyn514

Remove unnecessary `Option` wrapping around `Crate.module`

I'm wondering if it was originally there so that we could `take` the
module which enables `after_krate` to take an `&Crate`. However, the two
impls of `after_krate` only use `Crate.name`, so we can pass just the
name instead.

src/librustdoc/clean/mod.rs

@@ -231,7 +231,7 @@ fn clean(&self, cx: &mut DocContext<'_>) -> Item {
 
         let what_rustc_thinks = Item::from_hir_id_and_parts(
             self.id,
-            self.name,
+            Some(self.name),
             ModuleItem(Module { is_crate: self.is_crate, items }),
             cx,
         );

src/librustdoc/clean/types.rs

@@ -51,7 +51,7 @@
 crate struct Crate {
     crate name: Symbol,
     crate src: FileName,
-    crate module: Option<Item>,
+    crate module: Item,
     crate externs: Vec<(CrateNum, ExternalCrate)>,
     crate primitives: Vec<(DefId, PrimitiveType)>,
     // These are later on moved into `CACHEKEY`, leaving the map empty.

src/librustdoc/clean/utils.rs

@@ -76,7 +76,7 @@
     Crate {
         name,
         src,
-        module: Some(module),
+        module,
         externs,
         primitives,
         external_traits: cx.external_traits.clone(),

src/librustdoc/core.rs

@@ -474,13 +474,12 @@ impl<'tcx> DocContext<'tcx> {
 
     let mut krate = tcx.sess.time("clean_crate", || clean::krate(&mut ctxt));
 
-    if let Some(ref m) = krate.module {
-        if m.doc_value().map(|d| d.is_empty()).unwrap_or(true) {
+    if krate.module.doc_value().map(|d| d.is_empty()).unwrap_or(true) {
         let help = "The following guide may be of use:\n\
                 https://doc.rust-lang.org/nightly/rustdoc/how-to-write-documentation.html";
         tcx.struct_lint_node(
             crate::lint::MISSING_CRATE_LEVEL_DOCS,
-                DocContext::as_local_hir_id(tcx, m.def_id).unwrap(),
+            DocContext::as_local_hir_id(tcx, krate.module.def_id).unwrap(),
             |lint| {
                 let mut diag =
                     lint.build("no documentation found for this crate's top-level module");
@@ -489,7 +488,6 @@ impl<'tcx> DocContext<'tcx> {
             },
         );
     }
-    }
 
     fn report_deprecated_attr(name: &str, diag: &rustc_errors::Handler, sp: Span) {
         let mut msg =
@@ -531,7 +529,7 @@ fn report_deprecated_attr(name: &str, diag: &rustc_errors::Handler, sp: Span) {
 
     // Process all of the crate attributes, extracting plugin metadata along
     // with the passes which we are supposed to run.
-    for attr in krate.module.as_ref().unwrap().attrs.lists(sym::doc) {
+    for attr in krate.module.attrs.lists(sym::doc) {
         let diag = ctxt.sess().diagnostic();
 
         let name = attr.name_or_empty();

src/librustdoc/doctree.rs

@@ -5,7 +5,7 @@
 use rustc_hir as hir;
 
 crate struct Module<'hir> {
-    crate name: Option<Symbol>,
+    crate name: Symbol,
     crate where_outer: Span,
     crate where_inner: Span,
     crate mods: Vec<Module<'hir>>,
@@ -18,7 +18,7 @@
 }
 
 impl Module<'hir> {
-    crate fn new(name: Option<Symbol>) -> Module<'hir> {
+    crate fn new(name: Symbol) -> Module<'hir> {
         Module {
             name,
             id: hir::CRATE_HIR_ID,

src/librustdoc/fold.rs

@@ -87,7 +87,7 @@ fn fold_mod(&mut self, m: Module) -> Module {
     }
 
     fn fold_crate(&mut self, mut c: Crate) -> Crate {
-        c.module = c.module.take().and_then(|module| self.fold_item(module));
+        c.module = self.fold_item(c.module).unwrap();
 
         {
             let external_traits = { std::mem::take(&mut *c.external_traits.borrow_mut()) };

src/librustdoc/formats/renderer.rs

 use rustc_middle::ty::TyCtxt;
-use rustc_span::edition::Edition;
+use rustc_span::{edition::Edition, Symbol};
 
 use crate::clean;
 use crate::config::RenderOptions;
@@ -40,7 +40,7 @@ fn init(
     /// A handler is available if the renderer wants to report errors.
     fn after_krate(
         &mut self,
-        krate: &clean::Crate,
+        crate_name: Symbol,
         diag: &rustc_errors::Handler,
     ) -> Result<(), Error>;
 
@@ -58,21 +58,15 @@ fn after_krate(
 ) -> Result<(), Error> {
     let prof = &tcx.sess.prof;
 
-    let (mut format_renderer, mut krate) = prof
+    let (mut format_renderer, krate) = prof
         .extra_verbose_generic_activity("create_renderer", T::descr())
         .run(|| T::init(krate, options, edition, cache, tcx))?;
 
-    let mut item = match krate.module.take() {
-        Some(i) => i,
-        None => return Ok(()),
-    };
-
-    item.name = Some(krate.name);
-
     // Render the crate documentation
-    let mut work = vec![(format_renderer.make_child_renderer(), item)];
+    let crate_name = krate.name;
+    let mut work = vec![(format_renderer.make_child_renderer(), krate.module)];
 
-    let unknown = rustc_span::Symbol::intern("<unknown item>");
+    let unknown = Symbol::intern("<unknown item>");
     while let Some((mut cx, item)) = work.pop() {
         if item.is_mod() {
             // modules are special because they add a namespace. We also need to
@@ -102,5 +96,5 @@ fn after_krate(
         }
     }
     prof.extra_verbose_generic_activity("renderer_after_krate", T::descr())
-        .run(|| format_renderer.after_krate(&krate, diag))
+        .run(|| format_renderer.after_krate(crate_name, diag))
 }

src/librustdoc/html/render/cache.rs

@@ -127,11 +127,8 @@
         crate_items.push(&*item);
     }
 
-    let crate_doc = krate
-        .module
-        .as_ref()
-        .map(|module| module.doc_value().map_or_else(String::new, |s| short_markdown_summary(&s)))
-        .unwrap_or_default();
+    let crate_doc =
+        krate.module.doc_value().map_or_else(String::new, |s| short_markdown_summary(&s));
 
     struct CrateData<'a> {
         doc: String,

src/librustdoc/html/render/context.rs

@@ -11,7 +11,7 @@
 use rustc_session::Session;
 use rustc_span::edition::Edition;
 use rustc_span::source_map::FileName;
-use rustc_span::symbol::sym;
+use rustc_span::{symbol::sym, Symbol};
 
 use super::cache::{build_index, ExternalLocation};
 use super::print_item::{full_path, item_path, print_item};
@@ -343,8 +343,7 @@ fn init(
 
         // Crawl the crate attributes looking for attributes which control how we're
         // going to emit HTML
-        if let Some(attrs) = krate.module.as_ref().map(|m| &m.attrs) {
-            for attr in attrs.lists(sym::doc) {
+        for attr in krate.module.attrs.lists(sym::doc) {
             match (attr.name_or_empty(), attr.value_str()) {
                 (sym::html_favicon_url, Some(s)) => {
                     layout.favicon = s.to_string();
@@ -367,7 +366,6 @@ fn init(
                 _ => {}
             }
         }
-        }
         let (sender, receiver) = channel();
         let mut scx = SharedContext {
             tcx,
@@ -447,12 +445,11 @@ fn make_child_renderer(&self) -> Self {
 
     fn after_krate(
         &mut self,
-        krate: &clean::Crate,
+        crate_name: Symbol,
         diag: &rustc_errors::Handler,
     ) -> Result<(), Error> {
-        let final_file = self.dst.join(&*krate.name.as_str()).join("all.html");
+        let final_file = self.dst.join(&*crate_name.as_str()).join("all.html");
         let settings_file = self.dst.join("settings.html");
-        let crate_name = krate.name;
 
         let mut root_path = self.dst.to_str().expect("invalid path").to_owned();
         if !root_path.ends_with('/') {
@@ -515,9 +512,9 @@ fn after_krate(
         if let Some(ref redirections) = self.shared.redirections {
             if !redirections.borrow().is_empty() {
                 let redirect_map_path =
-                    self.dst.join(&*krate.name.as_str()).join("redirect-map.json");
+                    self.dst.join(&*crate_name.as_str()).join("redirect-map.json");
                 let paths = serde_json::to_string(&*redirections.borrow()).unwrap();
-                self.shared.ensure_dir(&self.dst.join(&*krate.name.as_str()))?;
+                self.shared.ensure_dir(&self.dst.join(&*crate_name.as_str()))?;
                 self.shared.fs.write(&redirect_map_path, paths.as_bytes())?;
             }
         }

src/librustdoc/json/mod.rs

@@ -14,7 +14,7 @@
 use rustc_data_structures::fx::FxHashMap;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::Session;
-use rustc_span::edition::Edition;
+use rustc_span::{edition::Edition, Symbol};
 
 use rustdoc_json_types as types;
 
@@ -202,7 +202,7 @@ fn mod_item_out(&mut self, _item_name: &str) -> Result<(), Error> {
 
     fn after_krate(
         &mut self,
-        _krate: &clean::Crate,
+        _crate_name: Symbol,
         _diag: &rustc_errors::Handler,
     ) -> Result<(), Error> {
         debug!("Done with crate");

src/librustdoc/passes/collect_trait_impls.rs

@@ -131,14 +131,10 @@ fn add_deref_target(
         }
     }
 
-    let items = if let Some(ref mut it) = krate.module {
-        if let ModuleItem(Module { ref mut items, .. }) = *it.kind {
+    let items = if let ModuleItem(Module { ref mut items, .. }) = *krate.module.kind {
         items
     } else {
         panic!("collect-trait-impls can't run");
-        }
-    } else {
-        panic!("collect-trait-impls can't run");
     };
 
     items.extend(synth_impls);

src/librustdoc/visit_ast.rs

@@ -76,7 +76,7 @@ fn store_path(&mut self, did: DefId) {
             &Spanned { span: rustc_span::DUMMY_SP, node: hir::VisibilityKind::Public },
             hir::CRATE_HIR_ID,
             &krate.item.module,
-            Some(self.cx.tcx.crate_name),
+            self.cx.tcx.crate_name,
         );
         top_level_module.is_crate = true;
         // Attach the crate's exported macros to the top-level module.
@@ -114,7 +114,7 @@ fn store_path(&mut self, did: DefId) {
                     _ => continue 'exported_macros,
                 };
                 // Descend into the child module that matches this path segment (if any).
-                match cur_mod.mods.iter_mut().find(|child| child.name == Some(path_segment_ty_ns)) {
+                match cur_mod.mods.iter_mut().find(|child| child.name == path_segment_ty_ns) {
                     Some(child_mod) => cur_mod = &mut *child_mod,
                     None => continue 'exported_macros,
                 }
@@ -133,7 +133,7 @@ fn visit_mod_contents(
         vis: &'tcx hir::Visibility<'_>,
         id: hir::HirId,
         m: &'tcx hir::Mod<'tcx>,
-        name: Option<Symbol>,
+        name: Symbol,
     ) -> Module<'tcx> {
         let mut om = Module::new(name);
         om.where_outer = span;
@@ -312,13 +312,7 @@ fn visit_item(
                 om.items.push((item, renamed))
             }
             hir::ItemKind::Mod(ref m) => {
-                om.mods.push(self.visit_mod_contents(
-                    item.span,
-                    &item.vis,
-                    item.hir_id(),
-                    m,
-                    Some(name),
-                ));
+                om.mods.push(self.visit_mod_contents(item.span, &item.vis, item.hir_id(), m, name));
             }
             hir::ItemKind::Fn(..)
             | hir::ItemKind::ExternCrate(..)