An unknown field was specified into an enum's structure variant.
Erroneous code example:
enum Field { Fool { x: u32 }, } let s = Field::Fool { joke: 0 }; // error: struct variant `Field::Fool` has no field named `joke`
Verify you didn‘t misspell the field’s name or that the field exists. Example:
enum Field { Fool { joke: u32 }, } let s = Field::Fool { joke: 0 }; // ok!