File: generic-type-params-forward-mention.rs

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rustc 1.70.0%2Bdfsg1-9
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// Ensure that we get an error and not an ICE for this problematic case.
struct Foo<T = Option<U>, U = bool>(T, U);
//~^ ERROR generic parameters with a default cannot use forward declared identifiers
fn main() {
    let x: Foo;
}