Fix documentation typo
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@ -2388,14 +2388,14 @@ const fn foo() -> impl T { // error: `impl Trait` in const fn is unstable
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To enable this feature on a nightly version of rustc, add the `const_fn`
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feature flag:
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```compile_fail,E0723
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```
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#![feature(const_fn)]
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trait T {}
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impl T for () {}
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const fn foo() -> impl T { // error: `impl Trait` in const fn is unstable
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const fn foo() -> impl T {
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()
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}
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```
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