pub struct P;
pub struct Q;
pub struct R<T>(T);

// Checks that tuple and unit both work
pub fn side_effect() { }

// Check a non-tuple
pub fn not_tuple() -> P { loop {} }

// Check a 1-tuple
pub fn one() -> (P,) { loop {} }

// Check a 2-tuple
pub fn two() -> (P,P) { loop {} }

// Check a nested tuple
pub fn nest() -> (Q, R<(u32,)>) { loop {} }