Introduce OwnerNode::Crate.

compiler/rustc_passes/src/entry.rs

@@ -183,7 +183,7 @@ fn configure_main(tcx: TyCtxt<'_>, visitor: &EntryContext<'_, '_>) -> Option<(De
 }
 
 fn no_main_err(tcx: TyCtxt<'_>, visitor: &EntryContext<'_, '_>) {
-    let sp = tcx.hir().krate().item.inner;
+    let sp = tcx.hir().krate().module().inner;
     if *tcx.sess.parse_sess.reached_eof.borrow() {
         // There's an unclosed brace that made the parser reach `Eof`, we shouldn't complain about
         // the missing `fn main()` then as it might have been hidden inside an unclosed block.