error: any use of this value will cause an error
  --> $DIR/issue-49296.rs:19:16
   |
LL | const X: u64 = *wat(42);
   | ---------------^^^^^^^^-
   |                |
   |                pointer to alloc2 was dereferenced after this allocation got freed
   |
   = note: `#[deny(const_err)]` on by default

error: aborting due to previous error