disallow unsized enums

Author: TimNN

src/librustc/traits/error_reporting.rs

@@ -856,8 +856,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
                              trait_name));
             }
             ObligationCauseCode::FieldSized => {
-                err.note("only the last field of a struct or enum variant \
-                          may have a dynamically sized type");
+                err.note("only the last field of a struct may have a dynamically sized type");
             }
             ObligationCauseCode::ConstSized => {
                 err.note("constant expressions must have a statically known size");

src/librustc_typeck/check/wfcheck.rs

@@ -150,7 +150,7 @@ impl<'ccx, 'gcx> CheckTypeWellFormedVisitor<'ccx, 'gcx> {
                 self.check_variances_for_type_defn(item, ast_generics);
             }
             hir::ItemEnum(ref enum_def, ref ast_generics) => {
-                self.check_type_defn(item, false, |fcx| {
+                self.check_type_defn(item, true, |fcx| {
                     fcx.enum_variants(enum_def)
                 });