error: expected `,`, or `}`, found keyword `fn` --> $DIR/fn-field-parse-error-ice.rs:4:16 | LL | inner : dyn fn () | ^ help: try adding a comma: `,` error: functions are not allowed in struct definitions --> $DIR/fn-field-parse-error-ice.rs:4:17 | LL | inner : dyn fn () | ^^ | = help: unlike in C++, Java, and C#, functions are declared in `impl` blocks = help: see https://doc.rust-lang.org/book/ch05-03-method-syntax.html for more information error[E0412]: cannot find type `dyn` in this scope --> $DIR/fn-field-parse-error-ice.rs:4:13 | LL | inner : dyn fn () | ^^^ not found in this scope error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0412`.