Add some tests

src/test/run-pass/issue-31776.rs

@@ -0,0 +1,64 @@
+// Copyright 2016 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.
+
+// Various scenarios in which `pub` is required in blocks
+
+struct S;
+
+mod m {
+    fn f() {
+        impl ::S {
+            pub fn s(&self) {}
+        }
+    }
+}
+
+// ------------------------------------------------------
+
+pub trait Tr {
+    type A;
+}
+pub struct S1;
+
+fn f() {
+    pub struct Z;
+
+    impl ::Tr for ::S1 {
+        type A = Z; // Private-in-public error unless `struct Z` is pub
+    }
+}
+
+// ------------------------------------------------------
+
+trait Tr1 {
+    type A;
+    fn pull(&self) -> Self::A;
+}
+struct S2;
+
+mod m1 {
+    fn f() {
+        struct Z {
+            pub field: u8
+        }
+
+        impl ::Tr1 for ::S2 {
+            type A = Z;
+            fn pull(&self) -> Self::A { Z{field: 10} }
+        }
+    }
+}
+
+// ------------------------------------------------------
+
+fn main() {
+    S.s(); // Privacy error, unless `fn s` is pub
+    let a = S2.pull().field; // Privacy error unless `field: u8` is pub
+}