3 files changed, 41 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui-toml/toml_trivially_copy/clippy.toml b/src/tools/clippy/tests/ui-toml/toml_trivially_copy/clippy.toml
new file mode 100644
index 000000000..3b96f1fd0
--- /dev/null
+++ b/src/tools/clippy/tests/ui-toml/toml_trivially_copy/clippy.toml
@@ -0,0 +1 @@
+trivial-copy-size-limit = 2
diff --git a/src/tools/clippy/tests/ui-toml/toml_trivially_copy/test.rs b/src/tools/clippy/tests/ui-toml/toml_trivially_copy/test.rs
new file mode 100644
index 000000000..fb0e226f3
--- /dev/null
+++ b/src/tools/clippy/tests/ui-toml/toml_trivially_copy/test.rs
@@ -0,0 +1,20 @@
+// normalize-stderr-test "\(\d+ byte\)" -> "(N byte)"
+// normalize-stderr-test "\(limit: \d+ byte\)" -> "(limit: N byte)"
+
+#![deny(clippy::trivially_copy_pass_by_ref)]
+
+#[derive(Copy, Clone)]
+struct Foo(u8);
+
+#[derive(Copy, Clone)]
+struct Bar(u32);
+
+fn good(a: &mut u32, b: u32, c: &Bar, d: &u32) {}
+
+fn bad(x: &u16, y: &Foo) {}
+
+fn main() {
+    let (mut a, b, c, d, x, y) = (0, 0, Bar(0), 0, 0, Foo(0));
+    good(&mut a, b, &c, &d);
+    bad(&x, &y);
+}
diff --git a/src/tools/clippy/tests/ui-toml/toml_trivially_copy/test.stderr b/src/tools/clippy/tests/ui-toml/toml_trivially_copy/test.stderr
new file mode 100644
index 000000000..b3ef5928e
--- /dev/null
+++ b/src/tools/clippy/tests/ui-toml/toml_trivially_copy/test.stderr
@@ -0,0 +1,20 @@
+error: this argument (N byte) is passed by reference, but would be more efficient if passed by value (limit: N byte)
+  --> $DIR/test.rs:14:11
+   |
+LL | fn bad(x: &u16, y: &Foo) {}
+   |           ^^^^ help: consider passing by value instead: `u16`
+   |
+note: the lint level is defined here
+  --> $DIR/test.rs:4:9
+   |
+LL | #![deny(clippy::trivially_copy_pass_by_ref)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: this argument (N byte) is passed by reference, but would be more efficient if passed by value (limit: N byte)
+  --> $DIR/test.rs:14:20
+   |
+LL | fn bad(x: &u16, y: &Foo) {}
+   |                    ^^^^ help: consider passing by value instead: `Foo`
+
+error: aborting due to 2 previous errors
+