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Update 19-5 to demonstrate returning a closure using impl Trait #3536

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@Colonial-Dev Colonial-Dev commented Feb 13, 2023

Adds a second listing to 19-5 to demonstrate returning a closure using the impl Trait return type syntax instead of a boxed trait object. The demo compiler error even mentions the feature, so this fits in quite nicely.

return closures in addition to boxed trait objects
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