Chapter 18: Build error

Vapor 4 & Swift version 5.3.1 & Mac OS bBig Sur 11.0.1.
File configure.swift

error message: cannot convert value of type ‘DatabaseIdentifier<User.Database>’ to expected argument type ‘DatabaseIdentifier<User.Database>’

migrations.add(model: User.self, database: .psql)
migrations.add(model: Acronym.self, database: .psql)
migrations.add(model: Category.self, database: .psql)
migrations.add(model: AcronymCategoryPivot.self, database: .psql)
migrations.add(model: Token.self, database: .psql)

This is a compiler regression - see the fix here