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It does, it has a default global heap allocator.

• simonask 2y ago
  That's not a "Rust runtime", that's an extension point. The default setting is `malloc()`.
• steveklabnik 2y ago
  That's not part of Rust, that's a feature of its standard library. This is the same as C, where a freestanding implementation doesn't include malloc. Put another way, there's no issues with a library using its own heap if it wants to.