1 files changed, 84 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/mut_range_bound.rs b/src/tools/clippy/tests/ui/mut_range_bound.rs
new file mode 100644
index 000000000..e1ae1ef92
--- /dev/null
+++ b/src/tools/clippy/tests/ui/mut_range_bound.rs
@@ -0,0 +1,84 @@
+#![allow(unused)]
+
+fn main() {}
+
+fn mut_range_bound_upper() {
+    let mut m = 4;
+    for i in 0..m {
+        m = 5;
+    } // warning
+}
+
+fn mut_range_bound_lower() {
+    let mut m = 4;
+    for i in m..10 {
+        m *= 2;
+    } // warning
+}
+
+fn mut_range_bound_both() {
+    let mut m = 4;
+    let mut n = 6;
+    for i in m..n {
+        m = 5;
+        n = 7;
+    } // warning (1 for each mutated bound)
+}
+
+fn mut_range_bound_no_mutation() {
+    let mut m = 4;
+    for i in 0..m {
+        continue;
+    } // no warning
+}
+
+fn mut_borrow_range_bound() {
+    let mut m = 4;
+    for i in 0..m {
+        let n = &mut m; // warning
+        *n += 1;
+    }
+}
+
+fn immut_borrow_range_bound() {
+    let mut m = 4;
+    for i in 0..m {
+        let n = &m; // should be no warning?
+    }
+}
+
+fn immut_range_bound() {
+    let m = 4;
+    for i in 0..m {
+        continue;
+    } // no warning
+}
+
+fn mut_range_bound_break() {
+    let mut m = 4;
+    for i in 0..m {
+        if m == 4 {
+            m = 5; // no warning because of immediate break
+            break;
+        }
+    }
+}
+
+fn mut_range_bound_no_immediate_break() {
+    let mut m = 4;
+    for i in 0..m {
+        m = 2; // warning because it is not immediately followed by break
+        if m == 4 {
+            break;
+        }
+    }
+
+    let mut n = 3;
+    for i in n..10 {
+        if n == 4 {
+            n = 1; // FIXME: warning because is is not immediately followed by break
+            let _ = 2;
+            break;
+        }
+    }
+}