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Rollup merge of rust-lang#81055 - matthewjasper:non-fatal-overflow, r…
…=nikomatsakis Make hitting the recursion limit in projection non-fatal This change was originally made in rust-lang#80246 to avoid future (effectively) infinite loop bugs in projections, but wundergraph relies on rustc recovering here. cc rust-lang#80953 r? `@nikomatsakis`
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58 changes: 58 additions & 0 deletions
58
src/test/ui/associated-types/project-recursion-limit-non-fatal.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| // Regression test for #80953. Hitting the recursion limit in projection | ||
| // is non-fatal. The above code, minimised from wundergraph shows a case | ||
| // where this is relied on. | ||
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| // check-pass | ||
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| struct AlternateTable {} | ||
| struct AlternateQuery {} | ||
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| pub trait Query {} | ||
| pub trait AsQuery { | ||
| type Query; | ||
| } | ||
| impl<T: Query> AsQuery for T { | ||
| type Query = Self; | ||
| } | ||
| impl AsQuery for AlternateTable { | ||
| type Query = AlternateQuery; | ||
| } | ||
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| pub trait Table: AsQuery { | ||
| type PrimaryKey; | ||
| } | ||
| impl Table for AlternateTable { | ||
| type PrimaryKey = (); | ||
| } | ||
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| pub trait FilterDsl<Predicate> { | ||
| type Output; | ||
| } | ||
| pub type Filter<Source, Predicate> = <Source as FilterDsl<Predicate>>::Output; | ||
| impl<T, Predicate> FilterDsl<Predicate> for T | ||
| where | ||
| T: Table, | ||
| T::Query: FilterDsl<Predicate>, | ||
| { | ||
| type Output = Filter<T::Query, Predicate>; | ||
| } | ||
| impl<Predicate> FilterDsl<Predicate> for AlternateQuery { | ||
| type Output = &'static str; | ||
| } | ||
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| pub trait HandleDelete { | ||
| type Filter; | ||
| } | ||
| impl<T> HandleDelete for T | ||
| where | ||
| T: Table, | ||
| T::Query: FilterDsl<T::PrimaryKey>, | ||
| Filter<T::Query, T::PrimaryKey>: , | ||
| { | ||
| type Filter = Filter<T::Query, T::PrimaryKey>; | ||
| } | ||
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| fn main() { | ||
| let x: <AlternateTable as HandleDelete>::Filter = "Hello, world"; | ||
| println!("{}", x); | ||
| } |
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