The source_did may not be local, so don't unwrap the

`as_local_node_id`, instead just compare against `Some(id)`.
Fixes #29161.

Author: nikomatsakis

src/librustc_privacy/lib.rs

@@ -671,8 +671,8 @@ impl<'a, 'tcx> PrivacyVisitor<'a, 'tcx> {
         // ancestry. (Both the item being checked and its parent must
         // be local.)
         let def_id = source_did.unwrap_or(to_check);
-        let node_id = self.tcx.map.as_local_node_id(def_id).unwrap();
-        let (err_span, err_msg) = if id == node_id {
+        let node_id = self.tcx.map.as_local_node_id(def_id);
+        let (err_span, err_msg) = if Some(id) == node_id {
             return Some((span, format!("{} is private", msg), None));
         } else {
             (span, format!("{} is inaccessible", msg))

src/test/compile-fail/issue-29161.rs

@@ -0,0 +1,26 @@
+// Copyright 2015 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.
+
+mod a {
+    struct A;
+
+    impl Default for A {
+        pub fn default() -> A {
+            //~^ ERROR E0449
+            A;
+        }
+    }
+}
+
+
+fn main() {
+    a::A::default();
+    //~^ ERROR method `default` is inaccessible
+ }