error: expected identifier, found keyword `pub`
  --> $DIR/issue-28433.rs:4:5
   |
LL |     pub duck,
   |     ^^^ expected identifier, found keyword
help: you can escape reserved keywords to use them as identifiers
   |
LL |     r#pub duck,
   |     ^^^^^

error: expected one of `(`, `,`, `=`, `{`, or `}`, found `duck`
  --> $DIR/issue-28433.rs:4:9
   |
LL |     pub duck,
   |         ^^^^ expected one of `(`, `,`, `=`, `{`, or `}` here

error: aborting due to 2 previous errors