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The difference between the two is that "OnceCell" is more of a "vocabulary type" that is used to build other types and might get exported in public APIs, while
by dureuill 5y ago
The difference between the two is that "OnceCell" is more of a "vocabulary type" that is used to build other types and might get exported in public APIs, while regex is more of a "leaf type", if that makes sense. There's also something fundamental in "how do I build a static variable?".