error: expected one of `!`, `(`, `+`, `,`, `::`, `:`, `<`, `=`, or `>`, found `/`
  --> $DIR/removed-syntax-closure-lifetime.rs:1:22
   |
LL | type closure = Box<lt/fn()>;
   |                      ^ expected one of 9 possible tokens
   |
help: you might have meant to end the type parameters here
   |
LL | type closure = Box<lt>/fn()>;
   |                      +

error: aborting due to previous error