- cross-posted to:
- rust@lemmy.ml
- cross-posted to:
- rust@lemmy.ml
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How does the
const { None }example type-inference work? The size of the option type can’t be known without knowing the type of theSomevariant.Edit: aha, it doesn’t work as-is. It needs to infer the type of elements of
foofrom usage. https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=05a95c592626b6935ae812527aa6bbc6I don’t understand what the advantages of const expressions are.
Isn’t
const { None }the same as justNone?const expressions are evaluated at compile time and can be used in locations where you would have to otherwise specify a literal (or something that amounts to a named literal like a const value).
