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Replicate autotraits test from proc-macro2
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Original file line number | Diff line number | Diff line change |
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use proc_macro2::*; | ||
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macro_rules! assert_impl { | ||
($ty:ident is $($marker:ident) and +) => { | ||
#[test] | ||
#[allow(non_snake_case)] | ||
fn $ty() { | ||
fn assert_implemented<T: $($marker +)+>() {} | ||
assert_implemented::<$ty>(); | ||
} | ||
}; | ||
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($ty:ident is not $($marker:ident) or +) => { | ||
#[test] | ||
#[allow(non_snake_case)] | ||
fn $ty() { | ||
$( | ||
{ | ||
// Implemented for types that implement $marker. | ||
trait IsNotImplemented { | ||
fn assert_not_implemented() {} | ||
} | ||
impl<T: $marker> IsNotImplemented for T {} | ||
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// Implemented for the type being tested. | ||
trait IsImplemented { | ||
fn assert_not_implemented() {} | ||
} | ||
impl IsImplemented for $ty {} | ||
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// If $ty does not implement $marker, there is no ambiguity | ||
// in the following trait method call. | ||
<$ty>::assert_not_implemented(); | ||
} | ||
)+ | ||
} | ||
}; | ||
} | ||
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assert_impl!(Delimiter is Send and Sync); | ||
assert_impl!(Spacing is Send and Sync); | ||
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assert_impl!(Group is not Send or Sync); | ||
assert_impl!(Ident is not Send or Sync); | ||
assert_impl!(LexError is not Send or Sync); | ||
assert_impl!(Literal is not Send or Sync); | ||
assert_impl!(Punct is not Send or Sync); | ||
assert_impl!(Span is not Send or Sync); | ||
assert_impl!(TokenStream is not Send or Sync); | ||
assert_impl!(TokenTree is not Send or Sync); |