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The try_reserve method is exposed on all collection types, e.g. [1],but it is still unstable.

[1]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try...

I did not write my own stdlib since I didn't need it yet (the blog has no heap allocation yet). And I think infallible allocation is good enough for the beginning.

But I think it should be possible to create a fallible wrapper library around liballoc quite easily. We only need an appropriate call to try_reserve for every wrapped function. For example, `push` would do a `try_reserve(1)` before calling the push function of liballoc.



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