1 files changed, 74 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/many_single_char_names.rs b/src/tools/clippy/tests/ui/many_single_char_names.rs
new file mode 100644
index 000000000..88fcce668
--- /dev/null
+++ b/src/tools/clippy/tests/ui/many_single_char_names.rs
@@ -0,0 +1,74 @@
+#![allow(clippy::too_many_arguments, clippy::diverging_sub_expression)]
+#![warn(clippy::many_single_char_names)]
+
+fn bla() {
+    let a: i32;
+    let (b, c, d): (i32, i64, i16);
+    {
+        {
+            let cdefg: i32;
+            let blar: i32;
+        }
+        {
+            let e: i32;
+        }
+        {
+            let e: i32;
+            let f: i32;
+        }
+        match 5 {
+            1 => println!(),
+            e => panic!(),
+        }
+        match 5 {
+            1 => println!(),
+            _ => panic!(),
+        }
+    }
+}
+
+fn bindings(a: i32, b: i32, c: i32, d: i32, e: i32, f: i32, g: i32, h: i32) {}
+
+fn bindings2() {
+    let (a, b, c, d, e, f, g, h): (bool, bool, bool, bool, bool, bool, bool, bool) = unimplemented!();
+}
+
+fn shadowing() {
+    let a = 0i32;
+    let a = 0i32;
+    let a = 0i32;
+    let a = 0i32;
+    let a = 0i32;
+    let a = 0i32;
+    {
+        let a = 0i32;
+    }
+}
+
+fn patterns() {
+    enum Z {
+        A(i32),
+        B(i32),
+        C(i32),
+        D(i32),
+        E(i32),
+        F(i32),
+    }
+
+    // These should not trigger a warning, since the pattern bindings are a new scope.
+    match Z::A(0) {
+        Z::A(a) => {},
+        Z::B(b) => {},
+        Z::C(c) => {},
+        Z::D(d) => {},
+        Z::E(e) => {},
+        Z::F(f) => {},
+    }
+}
+
+#[allow(clippy::many_single_char_names)]
+fn issue_3198_allow_works() {
+    let (a, b, c, d, e) = (0, 0, 0, 0, 0);
+}
+
+fn main() {}