1 files changed, 69 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/type_complexity.rs b/src/tools/clippy/tests/ui/type_complexity.rs
new file mode 100644
index 000000000..86a7bd7b6
--- /dev/null
+++ b/src/tools/clippy/tests/ui/type_complexity.rs
@@ -0,0 +1,69 @@
+#![warn(clippy::all)]
+#![allow(unused, clippy::needless_pass_by_value, clippy::vec_box)]
+#![feature(associated_type_defaults)]
+
+type Alias = Vec<Vec<Box<(u32, u32, u32, u32)>>>; // no warning here
+
+const CST: (u32, (u32, (u32, (u32, u32)))) = (0, (0, (0, (0, 0))));
+static ST: (u32, (u32, (u32, (u32, u32)))) = (0, (0, (0, (0, 0))));
+
+struct S {
+    f: Vec<Vec<Box<(u32, u32, u32, u32)>>>,
+}
+
+struct Ts(Vec<Vec<Box<(u32, u32, u32, u32)>>>);
+
+enum E {
+    Tuple(Vec<Vec<Box<(u32, u32, u32, u32)>>>),
+    Struct { f: Vec<Vec<Box<(u32, u32, u32, u32)>>> },
+}
+
+impl S {
+    const A: (u32, (u32, (u32, (u32, u32)))) = (0, (0, (0, (0, 0))));
+    fn impl_method(&self, p: Vec<Vec<Box<(u32, u32, u32, u32)>>>) {}
+}
+
+trait T {
+    const A: Vec<Vec<Box<(u32, u32, u32, u32)>>>;
+    type B = Vec<Vec<Box<(u32, u32, u32, u32)>>>;
+    fn method(&self, p: Vec<Vec<Box<(u32, u32, u32, u32)>>>);
+    fn def_method(&self, p: Vec<Vec<Box<(u32, u32, u32, u32)>>>) {}
+}
+
+// Should not warn since there is likely no way to simplify this (#1013)
+impl T for () {
+    const A: Vec<Vec<Box<(u32, u32, u32, u32)>>> = vec![];
+
+    type B = Vec<Vec<Box<(u32, u32, u32, u32)>>>;
+
+    fn method(&self, p: Vec<Vec<Box<(u32, u32, u32, u32)>>>) {}
+}
+
+fn test1() -> Vec<Vec<Box<(u32, u32, u32, u32)>>> {
+    vec![]
+}
+
+fn test2(_x: Vec<Vec<Box<(u32, u32, u32, u32)>>>) {}
+
+fn test3() {
+    let _y: Vec<Vec<Box<(u32, u32, u32, u32)>>> = vec![];
+}
+
+#[repr(C)]
+struct D {
+    // should not warn, since we don't have control over the signature (#3222)
+    test4: extern "C" fn(
+        itself: &D,
+        a: usize,
+        b: usize,
+        c: usize,
+        d: usize,
+        e: usize,
+        f: usize,
+        g: usize,
+        h: usize,
+        i: usize,
+    ),
+}
+
+fn main() {}