error: indexing may panic
  --> $DIR/test.rs:11:9
   |
LL |         self.value[0] & 0b1000_0000 != 0
   |         ^^^^^^^^^^^^^
   |
   = help: consider using `.get(n)` or `.get_mut(n)` instead
   = note: the suggestion might not be applicable in constant blocks
   = note: `-D clippy::indexing-slicing` implied by `-D warnings`

error: aborting due to previous error