E2070 Syntax Errors
Syntax
wildcard type '?' is only allowed in function parameter and return types; not in variable declarations, struct fields, or enum types
When this occurs
This error is triggered when: wildcard type '?' is only allowed in function parameter and return types; not in variable declarations, struct fields, or enum types
Example error message
error[E2070]:
wildcard type '?' is only allowed in function parameter and return types; not in variable declarations, struct fields, or enum types
How to fix
Review the error message and check your code at the indicated location. The message describes what went wrong — fix the underlying issue it identifies.
Related errors
No related errors.