alloc-fmt-0.2.0 doesn't have any documentation.
alloc-fmt
alloc-fmt provides formatting and assertion macros similar to println,
eprintln, panic, assert, debug_assert, etc which are safe for use in a
global allocator. The standard library's formatting, panic, and assertion macros
can allocate, meaning that if they are used in the implementation of a global
allocator, it can cause infinite recursion. The macros in this crate do not
allocate in order to avoid this problem.