File: issue-20174.rs

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rustc 1.85.0%2Bdfsg3-1
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//@ run-pass
struct GradFn<F: Fn() -> usize>(F);

fn main() {
    let GradFn(x_squared) : GradFn<_> = GradFn(|| -> usize { 2 });
    let _  = x_squared();
}