Fixup missing renames from #[main] to #[rustc_main]

In fc35703 `#[main]` was removed and replaced with `#[rustc_main]`.
In some place the rename was forgotten, which makes the current code
confusing, because at first glance it seems that `#[main]` is still
around. Perform the renames also in these places.

compiler/rustc_ast/src/entry.rs

@@ -2,7 +2,7 @@
 pub enum EntryPointType {
     None,
     MainNamed,
-    MainAttr,
+    RustcMainAttr,
     Start,
     OtherMain, // Not an entry point, but some other function named main
 }

compiler/rustc_builtin_macros/src/test_harness.rs

@@ -147,7 +147,7 @@ fn entry_point_type(sess: &Session, item: &ast::Item, depth: usize) -> EntryPoin
             if sess.contains_name(&item.attrs, sym::start) {
                 EntryPointType::Start
             } else if sess.contains_name(&item.attrs, sym::rustc_main) {
-                EntryPointType::MainAttr
+                EntryPointType::RustcMainAttr
             } else if item.ident.name == sym::main {
                 if depth == 0 {
                     // This is a top-level function so can be 'main'
@@ -177,12 +177,12 @@ impl<'a> MutVisitor for EntryPointCleaner<'a> {
         let item = noop_flat_map_item(i, self).expect_one("noop did something");
         self.depth -= 1;
 
-        // Remove any #[main] or #[start] from the AST so it doesn't
+        // Remove any #[rustc_main] or #[start] from the AST so it doesn't
         // clash with the one we're going to add, but mark it as
         // #[allow(dead_code)] to avoid printing warnings.
         let item = match entry_point_type(self.sess, &item, self.depth) {
-            EntryPointType::MainNamed | EntryPointType::MainAttr | EntryPointType::Start => item
-                .map(|ast::Item { id, ident, attrs, kind, vis, span, tokens }| {
+            EntryPointType::MainNamed | EntryPointType::RustcMainAttr | EntryPointType::Start => {
+                item.map(|ast::Item { id, ident, attrs, kind, vis, span, tokens }| {
                     let allow_ident = Ident::new(sym::allow, self.def_site);
                     let dc_nested =
                         attr::mk_nested_word_item(Ident::new(sym::dead_code, self.def_site));
@@ -197,7 +197,8 @@ impl<'a> MutVisitor for EntryPointCleaner<'a> {
                         .collect();
 
                     ast::Item { id, ident, attrs, kind, vis, span, tokens }
-                }),
+                })
+            }
             EntryPointType::None | EntryPointType::OtherMain => item,
         };
 

compiler/rustc_passes/src/entry.rs

@@ -56,7 +56,7 @@ fn entry_point_type(ctxt: &EntryContext<'_>, id: ItemId, at_root: bool) -> Entry
     if ctxt.tcx.sess.contains_name(attrs, sym::start) {
         EntryPointType::Start
     } else if ctxt.tcx.sess.contains_name(attrs, sym::rustc_main) {
-        EntryPointType::MainAttr
+        EntryPointType::RustcMainAttr
     } else {
         if let Some(name) = ctxt.tcx.opt_item_name(id.def_id.to_def_id())
             && name == sym::main {
@@ -95,21 +95,21 @@ fn find_item(id: ItemId, ctxt: &mut EntryContext<'_>) {
         EntryPointType::OtherMain => {
             ctxt.non_main_fns.push(ctxt.tcx.def_span(id.def_id));
         }
-        EntryPointType::MainAttr => {
+        EntryPointType::RustcMainAttr => {
             if ctxt.attr_main_fn.is_none() {
                 ctxt.attr_main_fn = Some((id.def_id, ctxt.tcx.def_span(id.def_id.to_def_id())));
             } else {
                 struct_span_err!(
                     ctxt.tcx.sess,
                     ctxt.tcx.def_span(id.def_id.to_def_id()),
                     E0137,
-                    "multiple functions with a `#[main]` attribute"
+                    "multiple functions with a `#[rustc_main]` attribute"
                 )
                 .span_label(
                     ctxt.tcx.def_span(id.def_id.to_def_id()),
-                    "additional `#[main]` function",
+                    "additional `#[rustc_main]` function",
                 )
-                .span_label(ctxt.attr_main_fn.unwrap().1, "first `#[main]` function")
+                .span_label(ctxt.attr_main_fn.unwrap().1, "first `#[rustc_main]` function")
                 .emit();
             }
         }