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#[macro_export]
macro_rules! assert_unique_feature {
() => {};
($first:tt $(,$rest:tt)*) => {
$(
#[cfg(all(feature = $first, feature = $rest))]
compile_error!(concat!("features \"", $first, "\" and \"", $rest, "\" cannot be used together"));
)*
assert_unique_feature!($($rest),*);
}
}