Commit a78f92b

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add tests

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	`1`	`+//@ compile-flags: -Znext-solver`
	`2`	`+//@ check-pass`
	`3`	`+`
	`4`	`+// A regression test for trait-system-refactor-initiative#109.`
	`5`	`+`
	`6`	`+trait ParallelIterator: Sized {`
	`7`	`+ type Item;`
	`8`	`+}`
	`9`	`+trait IntoParallelIterator {`
	`10`	`+ type Iter: ParallelIterator<Item = Self::Item>;`
	`11`	`+ type Item;`
	`12`	`+}`
	`13`	`+impl<T: ParallelIterator> IntoParallelIterator for T {`
	`14`	`+ type Iter = T;`
	`15`	`+ type Item = T::Item;`
	`16`	`+}`
	`17`	`+`
	`18`	`+macro_rules! multizip_impls {`
	`19`	`+ ($($T:ident),+) => {`
	`20`	`+ fn foo<$( $T, )+>() where`
	`21`	`+ $(`
	`22`	`+ $T: IntoParallelIterator,`
	`23`	`+ $T::Iter: ParallelIterator,`
	`24`	`+ )+`
	`25`	`+ ($( $T, )+): IntoParallelIterator<Item = ($( $T::Item, )+)>,`
	`26`	`+ {}`
	`27`	`+ }`
	`28`	`+}`
	`29`	`+`
	`30`	`+multizip_impls! { A, B, C, D, E, F, G, H, I, J, K, L }`
	`31`	`+`
	`32`	`+fn main() {}`

Lines changed: 49 additions & 0 deletions

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	`1`	`+//@ compile-flags: -Znext-solver`
	`2`	`+//@ check-pass`
	`3`	`+`
	`4`	`+// A regression test for trait-system-refactor-initiative#109.`
	`5`	+// Unlike `rayon-hang-1.rs` the cycles in this test are not
	`6`	+// unproductive, which causes the `AliasRelate` goal when trying
	`7`	`+// to apply where-clauses to only error in the second iteration.`
	`8`	`+//`
	`9`	`+// This makes the exponential blowup to be significantly harder`
	`10`	`+// to avoid.`
	`11`	`+`
	`12`	`+trait ParallelIterator: Sized {`
	`13`	`+ type Item;`
	`14`	`+}`
	`15`	`+`
	`16`	`+trait IntoParallelIteratorIndir {`
	`17`	`+ type Iter: ParallelIterator<Item = Self::Item>;`
	`18`	`+ type Item;`
	`19`	`+}`
	`20`	`+impl<I> IntoParallelIteratorIndir for I`
	`21`	`+where`
	`22`	`+ Box<I>: IntoParallelIterator,`
	`23`	`+{`
	`24`	`+ type Iter = <Box<I> as IntoParallelIterator>::Iter;`
	`25`	`+ type Item = <Box<I> as IntoParallelIterator>::Item;`
	`26`	`+}`
	`27`	`+trait IntoParallelIterator {`
	`28`	`+ type Iter: ParallelIterator<Item = Self::Item>;`
	`29`	`+ type Item;`
	`30`	`+}`
	`31`	`+impl<T: ParallelIterator> IntoParallelIterator for T {`
	`32`	`+ type Iter = T;`
	`33`	`+ type Item = T::Item;`
	`34`	`+}`
	`35`	`+`
	`36`	`+macro_rules! multizip_impls {`
	`37`	`+ ($($T:ident),+) => {`
	`38`	`+ fn foo<'a, $( $T, )+>() where`
	`39`	`+ $(`
	`40`	`+ $T: IntoParallelIteratorIndir,`
	`41`	`+ $T::Iter: ParallelIterator,`
	`42`	`+ )+`
	`43`	`+ {}`
	`44`	`+ }`
	`45`	`+}`
	`46`	`+`
	`47`	`+multizip_impls! { A, B, C, D, E, F, G, H, I, J, K, L }`
	`48`	`+`
	`49`	`+fn main() {}`

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