Fix ReErased leaking into typeck due to typeof recovery

Author: compiler-errors

compiler/rustc_typeck/src/astconv/mod.rs

@@ -2667,7 +2667,10 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 self.normalize_ty(ast_ty.span, array_ty)
             }
             hir::TyKind::Typeof(ref e) => {
-                let ty = tcx.type_of(tcx.hir().local_def_id(e.hir_id));
+                let ty_erased = tcx.type_of(tcx.hir().local_def_id(e.hir_id));
+                let ty = tcx.fold_regions(ty_erased, |r, _| {
+                    if r.is_erased() { tcx.lifetimes.re_static } else { r }
+                });
                 let span = ast_ty.span;
                 tcx.sess.emit_err(TypeofReservedKeywordUsed {
                     span,

src/test/ui/typeof/issue-100183.rs

@@ -0,0 +1,6 @@
+struct Struct {
+    y: (typeof("hey"),),
+    //~^ ERROR `typeof` is a reserved keyword but unimplemented
+}
+
+fn main() {}

src/test/ui/typeof/issue-100183.stderr

@@ -0,0 +1,14 @@
+error[E0516]: `typeof` is a reserved keyword but unimplemented
+  --> $DIR/issue-100183.rs:2:9
+   |
+LL |     y: (typeof("hey"),),
+   |         ^^^^^^^^^^^^^ reserved keyword
+   |
+help: consider replacing `typeof(...)` with an actual type
+   |
+LL |     y: (&'static str,),
+   |         ~~~~~~~~~~~~
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0516`.