hide allocator related functions on unusable

@bolshoytoster

when functions that require an allocator are not usable, hide them from the public API altogether

this means:

we should just make the functions private, not compile them away

credits to @bolshoytoster and @pedrodesu for uncovering this

by the way, we would really benefit from a macro like that in add-syntax in crates.io

so we can tweak visibility much easily with a cfg attribute instead of having to duplicate things

Hi, can I work on this issue?

yeah, I've assigned you

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