Tries to allocate `count` blocks. If the allocation succeed, a pointer is returned. This function never allocates more than necessary. # Safety `size` must be nonzero, and `align` must be a power of 2 in the range `1..=2^29 / B`. # Errors Will return `AllocError` if the allocation was unsuccessful, in which case this function was a no-op.
( &self, size: usize, align: usize, )
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