use opt_item_name to pattern match items with names

Signed-off-by: Miguel Guarniz <mi9uel9@gmail.com>

compiler/rustc_middle/src/ty/mod.rs

@@ -1995,7 +1995,7 @@ impl<'tcx> TyCtxt<'tcx> {
     }
 
     /// Look up the name of a definition across crates. This does not look at HIR.
-    fn opt_item_name(self, def_id: DefId) -> Option<Symbol> {
+    pub fn opt_item_name(self, def_id: DefId) -> Option<Symbol> {
         if let Some(cnum) = def_id.as_crate_root() {
             Some(self.crate_name(cnum))
         } else {

compiler/rustc_passes/src/entry.rs

@@ -58,8 +58,8 @@ fn entry_point_type(ctxt: &EntryContext<'_>, id: ItemId, at_root: bool) -> Entry
     } else if ctxt.tcx.sess.contains_name(attrs, sym::rustc_main) {
         EntryPointType::MainAttr
     } else {
-        let item = ctxt.tcx.hir().item(id);
-        if item.ident.name == sym::main {
+        if let Some(name) = ctxt.tcx.opt_item_name(id.def_id.to_def_id())
+            && name == sym::main {
             if at_root {
                 // This is a top-level function so can be `main`.
                 EntryPointType::MainNamed