error[E0599]: no method named `honk` found for type `{integer}` in the current scope
  --> $DIR/issue-1871.rs:17:9
   |
LL |       f.honk() //~ ERROR no method named `honk` found
   |         ^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.