block3.go

package main

func main() {
    var _ = ([]string)(nil) == ([]string)(nil)                  // compiler error: invalid operation.
    var sb = (map[string]bool)(nil) == (map[string]bool)(nil)   // compiler error: invalid operation.
    var _ = (func())(nil) == (func())(nil)                      // compiler error: invalid operation.
}