```fsharp type Oops = Span<int> * Span<int> let f (x: Oops) = () let failsAsIntended (x: Span<int> * Span<int>) = () ``` `failsAsIntended` will fail to compile, since you can't tuple a Span. But `f` and the `Oops` declaration do compile.
failsAsIntendedwill fail to compile, since you can't tuple a Span. Butfand theOopsdeclaration do compile.