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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 {} }
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