warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
  --> $DIR/dropping_copy_types.rs:34:5
   |
LL |     drop(s1);
   |     ^^^^^--^
   |          |
   |          argument has type `SomeStruct`
   |
   = note: use `let _ = ...` to ignore the expression or result
note: the lint level is defined here
  --> $DIR/dropping_copy_types.rs:3:9
   |
LL | #![warn(dropping_copy_types)]
   |         ^^^^^^^^^^^^^^^^^^^

warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
  --> $DIR/dropping_copy_types.rs:35:5
   |
LL |     drop(s2);
   |     ^^^^^--^
   |          |
   |          argument has type `SomeStruct`
   |
   = note: use `let _ = ...` to ignore the expression or result

warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
  --> $DIR/dropping_copy_types.rs:36:5
   |
LL |     drop(s3);
   |     ^^^^^--^
   |          |
   |          argument has type `&SomeStruct`
   |
   = note: use `let _ = ...` to ignore the expression or result
   = note: `#[warn(dropping_references)]` on by default

warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
  --> $DIR/dropping_copy_types.rs:37:5
   |
LL |     drop(s4);
   |     ^^^^^--^
   |          |
   |          argument has type `SomeStruct`
   |
   = note: use `let _ = ...` to ignore the expression or result

warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
  --> $DIR/dropping_copy_types.rs:38:5
   |
LL |     drop(s5);
   |     ^^^^^--^
   |          |
   |          argument has type `&SomeStruct`
   |
   = note: use `let _ = ...` to ignore the expression or result

warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
  --> $DIR/dropping_copy_types.rs:50:5
   |
LL |     drop(a2);
   |     ^^^^^--^
   |          |
   |          argument has type `&AnotherStruct`
   |
   = note: use `let _ = ...` to ignore the expression or result

warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
  --> $DIR/dropping_copy_types.rs:52:5
   |
LL |     drop(a4);
   |     ^^^^^--^
   |          |
   |          argument has type `&AnotherStruct`
   |
   = note: use `let _ = ...` to ignore the expression or result

warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
  --> $DIR/dropping_copy_types.rs:71:13
   |
LL |             drop(println_and(13));
   |             ^^^^^---------------^
   |                  |
   |                  argument has type `i32`
   |
   = note: use `let _ = ...` to ignore the expression or result

warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
  --> $DIR/dropping_copy_types.rs:74:14
   |
LL |         3 if drop(println_and(14)) == () => (),
   |              ^^^^^---------------^
   |                   |
   |                   argument has type `i32`
   |
   = note: use `let _ = ...` to ignore the expression or result

warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
  --> $DIR/dropping_copy_types.rs:76:14
   |
LL |         4 => drop(2),
   |              ^^^^^-^
   |                   |
   |                   argument has type `i32`
   |
   = note: use `let _ = ...` to ignore the expression or result

warning: 10 warnings emitted