Function free 

pub fn free<T>(ptr: *mut T) -> Result<(), DeallocationError>

• A reasonably safe implementation of free.
• This function will free a pointer allocated by alloc.
• Caller guarantees that the provided pointer was allocated by this crate’s alloc function.
• Providing NULL is safe and will return Err(DeallocationError::NullPtr).
• Providing any other pointer causes undefined behaviour.

Errors

• Returns Err(DeallocationError) if a safety check fails.