E0203: An attribute must start its own line

An attribute before a declaration (@doc, @deprecated, a typed attribute, a decorator) is written on its own line. Several attributes may share a line, but the first of them starts it, and the declaration follows on the next line.

Wrong

func helper() {} @doc("Lists the users")
func listUsers() []User { … }

Right

func helper() {}

@doc("Lists the users")
func listUsers() []User { … }