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並前往https://stackoverflow.com/questions/51121446/how-do-i-assert-an-enum-is-a-specific-variant-if-i-dont-care-about-its-fields

How do I assert an enum is a specific variant if I don't care ...

Rust 1.42. You can use std::matches : assert!(matches!(return_with_fields(), MyEnum::WithFields { .. }));. Previous versions.

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