1 files changed, 62 insertions, 0 deletions
diff --git a/tests/ui/trivial_casts-rpass.rs b/tests/ui/trivial_casts-rpass.rs
new file mode 100644
index 00000000000..8e49468bf0c
--- /dev/null
+++ b/tests/ui/trivial_casts-rpass.rs
@@ -0,0 +1,62 @@
+// run-pass
+// Test that all coercions can actually be done using casts (modulo the lints).
+
+#![allow(trivial_casts, trivial_numeric_casts)]
+
+trait Foo {
+    fn foo(&self) {}
+}
+
+pub struct Bar;
+
+impl Foo for Bar {}
+
+pub fn main() {
+    // Numeric
+    let _ = 42_i32 as i32;
+    let _ = 42_u8 as u8;
+
+    // & to * pointers
+    let x: &u32 = &42;
+    let _ = x as *const u32;
+
+    let x: &mut u32 = &mut 42;
+    let _ = x as *mut u32;
+
+    // unsize array
+    let x: &[u32; 3] = &[42, 43, 44];
+    let _ = x as &[u32];
+    let _ = x as *const [u32];
+
+    let x: &mut [u32; 3] = &mut [42, 43, 44];
+    let _ = x as &mut [u32];
+    let _ = x as *mut [u32];
+
+    let x: Box<[u32; 3]> = Box::new([42, 43, 44]);
+    let _ = x as Box<[u32]>;
+
+    // unsize trait
+    let x: &Bar = &Bar;
+    let _ = x as &dyn Foo;
+    let _ = x as *const dyn Foo;
+
+    let x: &mut Bar = &mut Bar;
+    let _ = x as &mut dyn Foo;
+    let _ = x as *mut dyn Foo;
+
+    let x: Box<Bar> = Box::new(Bar);
+    let _ = x as Box<dyn Foo>;
+
+    // functions
+    fn baz(_x: i32) {}
+    let _ = &baz as &dyn Fn(i32);
+    let x = |_x: i32| {};
+    let _ = &x as &dyn Fn(i32);
+}
+
+// subtyping
+pub fn test_subtyping<'a, 'b: 'a>(a: &'a Bar, b: &'b Bar) {
+    let _ = a as &'a Bar;
+    let _ = b as &'a Bar;
+    let _ = b as &'b Bar;
+}