error: any use of this value will cause an error
  --> $DIR/issue-49296.rs:19:16
   |
LL | const X: u64 = *wat(42);
   | ---------------^^^^^^^^-
   |                |
   |                pointer to alloc1 was dereferenced after this allocation got freed
   |
   = note: `#[deny(const_err)]` on by default
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>

error: aborting due to previous error