error[E0658]: attributes on expressions are experimental
  --> $DIR/invalid-reprs.rs:2:13
   |
LL |     let y = #[repr(uwu(4))]
   |             ^^^^^^^^^^^^^^^
   |
   = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
   = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error[E0425]: cannot find function `id` in this scope
  --> $DIR/invalid-reprs.rs:5:7
   |
LL |     (&id(5));
   |       ^^ not found in this scope
   |
help: consider importing this function
   |
LL + use std::process::id;
   |

error[E0552]: unrecognized representation hint
  --> $DIR/invalid-reprs.rs:2:20
   |
LL |     let y = #[repr(uwu(4))]
   |                    ^^^^^^
   |
   = help: valid reprs are `Rust` (default), `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html?highlight=repr#representations>

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0425, E0552, E0658.
For more information about an error, try `rustc --explain E0425`.