2 files changed, 24 insertions, 17 deletions

diff --git a/crates/ra_hir_ty/src/traits/chalk.rs b/crates/ra_hir_ty/src/traits/chalk.rs
index 5298dbecf..1c7065364 100644
--- a/crates/ra_hir_ty/src/traits/chalk.rs
+++ b/crates/ra_hir_ty/src/traits/chalk.rs
@@ -183,6 +183,7 @@ impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
                     .collect(),
                 1,
             ),
+            where_clauses: make_binders(vec![], 0),
         };
         let num_vars = datas.num_binders;
         Arc::new(OpaqueTyDatum { opaque_ty_id: id, bound: make_binders(bound, num_vars) })
@@ -193,15 +194,6 @@ impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
         Ty::Unknown.to_chalk(self.db)
     }
 
-    fn force_impl_for(
-        &self,
-        _well_known: rust_ir::WellKnownTrait,
-        _ty: &chalk_ir::TyData<Interner>,
-    ) -> Option<bool> {
-        // this method is mostly for rustc
-        None
-    }
-
     fn is_object_safe(&self, _trait_id: chalk_ir::TraitId<Interner>) -> bool {
         // FIXME: implement actual object safety
         true
@@ -547,8 +539,13 @@ pub(crate) fn fn_def_datum_query(
         ),
         where_clauses,
     };
-    let datum =
-        FnDefDatum { id: fn_def_id, binders: make_binders(bound, sig.num_binders), abi: () };
+    let datum = FnDefDatum {
+        id: fn_def_id,
+        abi: (),
+        safety: chalk_ir::Safety::Safe,
+        variadic: sig.value.is_varargs,
+        binders: make_binders(bound, sig.num_binders),
+    };
     Arc::new(datum)
 }
 
diff --git a/crates/ra_hir_ty/src/traits/chalk/mapping.rs b/crates/ra_hir_ty/src/traits/chalk/mapping.rs
index 09d8347ca..b3e92993d 100644
--- a/crates/ra_hir_ty/src/traits/chalk/mapping.rs
+++ b/crates/ra_hir_ty/src/traits/chalk/mapping.rs
@@ -30,11 +30,16 @@ impl ToChalk for Ty {
             Ty::Apply(apply_ty) => match apply_ty.ctor {
                 TypeCtor::Ref(m) => ref_to_chalk(db, m, apply_ty.parameters),
                 TypeCtor::Array => array_to_chalk(db, apply_ty.parameters),
-                TypeCtor::FnPtr { num_args: _, is_varargs: _ } => {
-                    // FIXME: handle is_varargs
+                TypeCtor::FnPtr { num_args: _, is_varargs } => {
                     let substitution = apply_ty.parameters.to_chalk(db).shifted_in(&Interner);
-                    chalk_ir::TyData::Function(chalk_ir::Fn { num_binders: 0, substitution })
-                        .intern(&Interner)
+                    chalk_ir::TyData::Function(chalk_ir::FnPointer {
+                        num_binders: 0,
+                        abi: (),
+                        safety: chalk_ir::Safety::Safe,
+                        variadic: is_varargs,
+                        substitution,
+                    })
+                    .intern(&Interner)
                 }
                 _ => {
                     let name = apply_ty.ctor.to_chalk(db);
@@ -118,7 +123,12 @@ impl ToChalk for Ty {
                 let parameters = from_chalk(db, opaque_ty.substitution);
                 Ty::Opaque(OpaqueTy { opaque_ty_id: impl_trait_id, parameters })
             }
-            chalk_ir::TyData::Function(chalk_ir::Fn { num_binders, substitution }) => {
+            chalk_ir::TyData::Function(chalk_ir::FnPointer {
+                num_binders,
+                variadic,
+                substitution,
+                ..
+            }) => {
                 assert_eq!(num_binders, 0);
                 let parameters: Substs = from_chalk(
                     db,
@@ -127,7 +137,7 @@ impl ToChalk for Ty {
                 Ty::Apply(ApplicationTy {
                     ctor: TypeCtor::FnPtr {
                         num_args: (parameters.len() - 1) as u16,
-                        is_varargs: false,
+                        is_varargs: variadic,
                     },
                     parameters,
                 })