error: suffixed literals are not allowed in attributes
  --> $DIR/malformed-interpolated.rs:13:8
   |
LL | check!(0u8);
   |        ^^^
   |
   = help: instead of using a suffixed literal (`1u8`, `1.0f32`, etc.), use an unsuffixed version (`1`, `1.0`, etc.)

error: unexpected token: `-0`
  --> $DIR/malformed-interpolated.rs:5:25
   |
LL |         #[rustc_dummy = $expr]
   |                         ^^^^^
...
LL | check!(-0); // ERROR, see above
   | ----------- in this macro invocation
   |
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: unexpected token: `0 + 0`
  --> $DIR/malformed-interpolated.rs:5:25
   |
LL |         #[rustc_dummy = $expr]
   |                         ^^^^^
...
LL | check!(0 + 0); // ERROR, see above
   | -------------- in this macro invocation
   |
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 3 previous errors