Add 'src/tools/clippy/' from commit 'd2708873ef711ec8ab45df1e984ecf24a96cd369'

git-subtree-dir: src/tools/clippy
git-subtree-mainline: 06c44816c1532e5ff08ad072f581fc068eb60e2e
git-subtree-split: d2708873ef711ec8ab45df1e984ecf24a96cd369

1 files changed, 21 insertions, 0 deletions

diff --git a/src/tools/clippy/tests/ui/string_add_assign.rs b/src/tools/clippy/tests/ui/string_add_assign.rs
new file mode 100644
index 00000000000..644991945cb
--- /dev/null
+++ b/src/tools/clippy/tests/ui/string_add_assign.rs
@@ -0,0 +1,21 @@
+// run-rustfix
+
+#[allow(clippy::string_add, unused)]
+#[warn(clippy::string_add_assign)]
+fn main() {
+    // ignores assignment distinction
+    let mut x = "".to_owned();
+
+    for _ in 1..3 {
+        x = x + ".";
+    }
+
+    let y = "".to_owned();
+    let z = y + "...";
+
+    assert_eq!(&x, &z);
+
+    let mut x = 1;
+    x = x + 1;
+    assert_eq!(2, x);
+}