Macro impls 

macro_rules! impls {
    () => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? core::alloc::GlobalAlloc for $ty:ty => $(::)? ialloc::fat::Realloc; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? core::alloc::Allocator(unstable $(1.50$(.0)?)?) for $ty:ty => $(::)? ialloc::fat::Realloc; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::fat::Alloc for $ty:ty $(where [$($where:tt)*])? => $(::)? ialloc::thin::Alloc; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::fat::Free for $ty:ty $(where [$($where:tt)*])? => $(::)? ialloc::thin::Free; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::fat::Realloc for $ty:ty $(where [$($where:tt)*])? => $(::)? ialloc::thin::Realloc; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::thin::Alloc for $ty:ty => $(::)? core::ops::Deref; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::thin::Free for $ty:ty => $(::)? core::ops::Deref; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::thin::Realloc for $ty:ty => $(::)? core::ops::Deref; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::thin::SizeOf for $ty:ty => $(::)? core::ops::Deref; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::thin::SizeOfDebug for $ty:ty => $(::)? core::ops::Deref; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::fat::Alloc for $ty:ty => $(::)? core::ops::Deref; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::fat::Free for $ty:ty => $(::)? core::ops::Deref; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? ialloc::fat::Realloc for $ty:ty => $(::)? core::ops::Deref; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? core::alloc::GlobalAlloc for $ty:ty => $(::)? core::ops::Deref; $($tt:tt)* ) => { ... };
    ( unsafe impl $([$($gdef:tt)*])? $(::)? core::alloc::Allocator(unstable $(1.50$(.0)?)?) for $ty:ty => $(::)? core::ops::Deref; $($tt:tt)* ) => { ... };
}

Implement ialloc (and/or core) traits in terms of other traits