SCappella questions

SCappella answers

• How to prove that "Type <> Set" (i.e. Type is not equal to Set) in Coq?
• How do I create mutable iterator over struct fields
• Returning a reference to a Box<dyn Trait>
• Why is my zero-cost alternative to RefCell not the standard way of achieving interior mutability?
• How can I require explicit return statements and forbid implicit returns?
• Insert in arbitrary nested HashMap
• How to use GenericArray?
• Borrow Checker: Cannot borrow as immutable because it is also borrowed as mutable
• Converting from NaiveDateTime to DateTime<Local> [duplicate]
• Coq: About "%" and "mod" as a notation symbol