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struct Foo(i32, bool); impl Foo { fn new(a: i32, b: bool) -> Foo { Foo(a, b) } fn test2() -> i32 { test_forward_decl() } } fn test_forward_decl() -> i32 { 123 } fn main() { let a; a = Foo::new(1, true); let b; b = Foo::test2(); }