assert_pending!(stream);
However, for the specific problem of generic programming the trade-off doesn't hold up. The alternative—type classes, as in Haskell, or traits, as in Rust—gives ad hoc polymorphism (functions that behave differently depending on the type) while preserving parametricity. We get specialisation where we ask for it, and reasoning guarantees everywhere else. It's extensible, too: anyone can add a new type to an existing type class. Zig's comptime dispatch is not.
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