rust/tests/auxiliary/test_macro.rs

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pub trait A {}
macro_rules! __implicit_hasher_test_macro {
(impl< $($impl_arg:tt),* > for $kind:ty where $($bounds:tt)*) => {
__implicit_hasher_test_macro!( ($($impl_arg),*) ($kind) ($($bounds)*) );
};
(($($impl_arg:tt)*) ($($kind_arg:tt)*) ($($bounds:tt)*)) => {
impl< $($impl_arg)* > test_macro::A for $($kind_arg)* where $($bounds)* { }
};
}