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Add tests for marker trait impls
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tests/marker.rs

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extern crate proc_macro2;
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use proc_macro2::*;
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macro_rules! assert_impl {
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($ty:ident is $($marker:ident) and +) => {
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#[test]
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#[allow(non_snake_case)]
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fn $ty() {
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fn assert_implemented<T: $($marker +)+>() {}
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assert_implemented::<$ty>();
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}
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};
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($ty:ident is not $($marker:ident) or +) => {
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#[test]
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#[allow(non_snake_case)]
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fn $ty() {
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$(
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{
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// Implemented for types that implement $marker.
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trait IsNotImplemented {
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fn assert_not_implemented() {}
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}
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impl<T: $marker> IsNotImplemented for T {}
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// Implemented for the type being tested.
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trait IsImplemented {
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fn assert_not_implemented() {}
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}
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impl IsImplemented for $ty {}
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// If $ty does not implement $marker, there is no ambiguity
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// in the following trait method call.
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<$ty>::assert_not_implemented();
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}
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)+
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}
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};
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}
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assert_impl!(Delimiter is Send and Sync);
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assert_impl!(Spacing is Send and Sync);
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assert_impl!(Group is not Send or Sync);
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assert_impl!(Ident is not Send or Sync);
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assert_impl!(LexError is not Send or Sync);
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assert_impl!(Literal is not Send or Sync);
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assert_impl!(Punct is not Send or Sync);
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assert_impl!(Span is not Send or Sync);
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assert_impl!(TokenStream is not Send or Sync);
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assert_impl!(TokenTree is not Send or Sync);
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#[cfg(procmacro2_semver_exempt)]
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mod semver_exempt {
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use super::*;
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assert_impl!(LineColumn is Send and Sync);
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assert_impl!(SourceFile is not Send or Sync);
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}

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