error: cast cannot be followed by `.yield`
  --> $DIR/postfix-yield-after-cast.rs:7:9
   |
LL |         0 as u8.yield
   |         ^^^^^^^
   |
help: try surrounding the expression in parentheses
   |
LL |         (0 as u8).yield
   |         +       +

error: aborting due to 1 previous error