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error[E0015]: cannot call non-const closure in constant functions
--> $DIR/const-closure-trait-method.rs:15:5
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LL | x(())
| ^^^^^
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= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider further restricting this bound
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LL | const fn need_const_closure<T: ~const FnOnce(()) -> i32 + ~const std::ops::FnOnce<((),)>>(x: T) -> i32 {
| ++++++++++++++++++++++++++++++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0015`.
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