Is RefCell allocated in the heap?

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And how could I figure out this myself ?

Sincerly yours,
Demeter, fighting the borrow checker.

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No. The only things that allocate are in alloc - Rust and https://doc.rust-lang.org/stable/collections/index.html . The types in those crates are re-exported in std in their well-known locations.

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Choosing your Guarantees has some of this info on the builtin types as well.

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