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Unable to build on rust version 1.43.0-nightly  #24

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@luojia65

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@luojia65

I tried to build following code with dependency on linked-list-allocator version 0.7.0:

use linked_list_allocator::LockedHeap;

However I got this error:

error[E0053]: method `alloc` has an incompatible type for trait
   --> /Users/mac/.cargo/registry/src/github.com-1ecc6299db9ec823/linked_list_allocator-0.7.0/src/lib.rs:133:5
    |
133 |     unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<u8>, AllocErr> {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected tuple, found struct `core::ptr::NonNull`
    |
    = note: expected fn pointer `unsafe fn(&mut Heap, core::alloc::Layout) -> core::result::Result<(core::ptr::NonNull<u8>, usize), _>`
               found fn pointer `unsafe fn(&mut Heap, core::alloc::Layout) -> core::result::Result<core::ptr::NonNull<u8>, _>`

My Rust version is rustc 1.43.0-nightly (75cf41afb 2020-03-04).

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