Move issue-42106 test from compile-fail to ui

2 files changed, 28 insertions, 0 deletions

diff --git a/src/test/ui/issue-42106.rs b/src/test/ui/issue-42106.rs
new file mode 100644
index 00000000000..f13f1dd1145
--- /dev/null
+++ b/src/test/ui/issue-42106.rs
@@ -0,0 +1,16 @@
+// 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.
+
+fn do_something<T>(collection: &mut Vec<T>) {
+    let _a = &collection;
+    collection.swap(1, 2);
+}
+
+fn main() {}
diff --git a/src/test/ui/issue-42106.stderr b/src/test/ui/issue-42106.stderr
new file mode 100644
index 00000000000..481cdb5f5b2
--- /dev/null
+++ b/src/test/ui/issue-42106.stderr
@@ -0,0 +1,12 @@
+error[E0502]: cannot borrow `*collection` as mutable because `collection` is also borrowed as immutable
+  --> $DIR/issue-42106.rs:13:5
+   |
+12 |     let _a = &collection;
+   |               ---------- immutable borrow occurs here
+13 |     collection.swap(1, 2);
+   |     ^^^^^^^^^^ mutable borrow occurs here
+14 | }
+   | - immutable borrow ends here
+
+error: aborting due to 2 previous errors
+