diff options
Diffstat (limited to 'vendor/chalk-solve-0.87.0/src/clauses/builtin_traits/tuple.rs')
-rw-r--r-- | vendor/chalk-solve-0.87.0/src/clauses/builtin_traits/tuple.rs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/vendor/chalk-solve-0.87.0/src/clauses/builtin_traits/tuple.rs b/vendor/chalk-solve-0.87.0/src/clauses/builtin_traits/tuple.rs new file mode 100644 index 000000000..a62447827 --- /dev/null +++ b/vendor/chalk-solve-0.87.0/src/clauses/builtin_traits/tuple.rs @@ -0,0 +1,30 @@ +use crate::clauses::ClauseBuilder; +use crate::rust_ir::WellKnownTrait; +use crate::{Interner, RustIrDatabase, TraitRef}; +use chalk_ir::{Floundered, Substitution, Ty, TyKind}; + +/// Add implicit impl for the `Tuple` trait for all tuples +pub fn add_tuple_program_clauses<I: Interner>( + db: &dyn RustIrDatabase<I>, + builder: &mut ClauseBuilder<'_, I>, + self_ty: Ty<I>, +) -> Result<(), Floundered> { + let interner = db.interner(); + + match self_ty.kind(interner) { + TyKind::Tuple(..) => { + let trait_id = db.well_known_trait_id(WellKnownTrait::Tuple).unwrap(); + + builder.push_fact(TraitRef { + trait_id, + substitution: Substitution::from1(interner, self_ty), + }); + + Ok(()) + } + + // Tuple trait is non-enumerable + TyKind::InferenceVar(..) | TyKind::BoundVar(_) | TyKind::Alias(..) => Err(Floundered), + _ => Ok(()), + } +} |