error: top-level or-patterns are not allowed in function parameters
  --> $DIR/fn-param-wrap-parens.rs:13:9
   |
LL | fn fun1(A | B: E) {}
   |         ^^^^^
   |
help: wrap the pattern in parentheses
   |
LL | fn fun1((A | B): E) {}
   |         +     +

error: aborting due to 1 previous error