It would be useful if get_maximum_output_size() were a const function

[hellertime]

It appears there is nothing that prevents get_maximum_output_size from being declared const, and if it were then it should be possible to use it in array initializers:

let buf = [u8; lz4_flex::block::compress::get_maximum_output_size(&input)];

[PSeitz]

Seems like a good idea if you know the size of your input, released with 0.11.3.

Stack allocation may be slower tough in some cases.