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struct Foo<A, B>(A, B); impl<X = i32> Foo<X, f32> { // { dg-error "defaults for type parameters are only allowed in .struct., .enum., .type., or .trait. definitions" } fn new(a: X, b: f32) -> Self { Self(a, b) } } fn main() { let a; a = Foo::new(123, 456f32); }