1 An unknown field was specified into an enum's structure variant.
3 Erroneous code example:
10 let s = Field::Fool { joke: 0 };
11 // error: struct variant `Field::Fool` has no field named `joke`
14 Verify you didn't misspell the field's name or that the field exists. Example:
21 let s = Field::Fool { joke: 0 }; // ok!