Auto merge of #46248 - zackmdavis:one_time_private_enum_variant_reexport_error, r=estebank

one-time diagnostics for private enum variants glob reëxport

![private_enum_reexport](https://user-images.githubusercontent.com/1076988/33224719-4e5805f0-d121-11e7-8bc0-a708a277a5db.png)

r? @estebank

src/test/compile-fail/issue-46209-private-enum-variant-reexport.rs

@@ -0,0 +1,51 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(crate_visibility_modifier)]
+
+mod rank {
+    pub use self::Professor::*;
+    //~^ ERROR enum is private and its variants cannot be reexported
+    pub use self::Lieutenant::{JuniorGrade, Full};
+    //~^ ERROR variant `JuniorGrade` is private and cannot be reexported
+    //~| ERROR variant `Full` is private and cannot be reexported
+    pub use self::PettyOfficer::*;
+    //~^ ERROR enum is private and its variants cannot be reexported
+    pub use self::Crewman::*;
+    //~^ ERROR enum is private and its variants cannot be reexported
+
+    enum Professor {
+        Adjunct,
+        Assistant,
+        Associate,
+        Full
+    }
+
+    enum Lieutenant {
+        JuniorGrade,
+        Full,
+    }
+
+    pub(in rank) enum PettyOfficer {
+        SecondClass,
+        FirstClass,
+        Chief,
+        MasterChief
+    }
+
+    crate enum Crewman {
+        Recruit,
+        Apprentice,
+        Full
+    }
+
+}
+
+fn main() {}

src/test/compile-fail/private-variant-reexport.rs

@@ -9,19 +9,19 @@
 // except according to those terms.
 
 mod m1 {
-    pub use ::E::V; //~ ERROR variant `V` is private, and cannot be reexported
+    pub use ::E::V; //~ ERROR variant `V` is private and cannot be reexported
 }
 
 mod m2 {
-    pub use ::E::{V}; //~ ERROR variant `V` is private, and cannot be reexported
+    pub use ::E::{V}; //~ ERROR variant `V` is private and cannot be reexported
 }
 
 mod m3 {
-    pub use ::E::V::{self}; //~ ERROR variant `V` is private, and cannot be reexported
+    pub use ::E::V::{self}; //~ ERROR variant `V` is private and cannot be reexported
 }
 
 mod m4 {
-    pub use ::E::*; //~ ERROR variant `V` is private, and cannot be reexported
+    pub use ::E::*; //~ ERROR enum is private and its variants cannot be reexported
 }
 
 enum E { V }