70 lines
1.7 KiB
Rust
70 lines
1.7 KiB
Rust
// run-pass
|
|
// check-run-results
|
|
|
|
// Tests ensuring that `dbg!(expr)` has the expected run-time behavior.
|
|
// as well as some compile time properties we expect.
|
|
|
|
#![allow(drop_copy)]
|
|
|
|
#[derive(Copy, Clone, Debug)]
|
|
struct Unit;
|
|
|
|
#[derive(Copy, Clone, Debug, PartialEq)]
|
|
struct Point<T> {
|
|
x: T,
|
|
y: T,
|
|
}
|
|
|
|
#[derive(Debug, PartialEq)]
|
|
struct NoCopy(usize);
|
|
|
|
fn main() {
|
|
let a: Unit = dbg!(Unit);
|
|
let _: Unit = dbg!(a);
|
|
// We can move `a` because it's Copy.
|
|
drop(a);
|
|
|
|
// `Point<T>` will be faithfully formatted according to `{:#?}`.
|
|
let a = Point { x: 42, y: 24 };
|
|
let b: Point<u8> = dbg!(Point { x: 42, y: 24 }); // test stringify!(..)
|
|
let c: Point<u8> = dbg!(b);
|
|
// Identity conversion:
|
|
assert_eq!(a, b);
|
|
assert_eq!(a, c);
|
|
// We can move `b` because it's Copy.
|
|
drop(b);
|
|
|
|
// Without parameters works as expected.
|
|
let _: () = dbg!();
|
|
|
|
// Test that we can borrow and that successive applications is still identity.
|
|
let a = NoCopy(1337);
|
|
let b: &NoCopy = dbg!(dbg!(&a));
|
|
assert_eq!(&a, b);
|
|
|
|
// Test involving lifetimes of temporaries:
|
|
fn f<'a>(x: &'a u8) -> &'a u8 { x }
|
|
let a: &u8 = dbg!(f(&42));
|
|
assert_eq!(a, &42);
|
|
|
|
// Test side effects:
|
|
let mut foo = 41;
|
|
assert_eq!(7331, dbg!({
|
|
foo += 1;
|
|
eprintln!("before");
|
|
7331
|
|
}));
|
|
assert_eq!(foo, 42);
|
|
|
|
// Test trailing comma:
|
|
assert_eq!(("Yeah",), dbg!(("Yeah",)));
|
|
|
|
// Test multiple arguments:
|
|
assert_eq!((1u8, 2u32), dbg!(1,
|
|
2));
|
|
|
|
// Test multiple arguments + trailing comma:
|
|
assert_eq!((1u8, 2u32, "Yeah"), dbg!(1u8, 2u32,
|
|
"Yeah",));
|
|
}
|