1 files changed, 8 insertions, 3 deletions
diff --git a/src/checker.rs b/src/checker.rs
index aefbb02..dc3dc3c 100644
--- a/src/checker.rs
+++ b/src/checker.rs
@@ -35,10 +35,15 @@ impl CheckerState {
                     let signature = self.check_signature(signature.clone())?;
                     self.add_signature(name, signature)
                 }
-                Decl::Instance { name, .. } => {
+                Decl::Instance {
+                    name,
+                    instance,
+                    signature,
+                } => {
                     self.assert_unbound_instance(name)?;
-
-                    return Err(CheckerError::Unimplemented("instances".to_string()));
+                    let signature = self.check_signature(signature.clone())?;
+                    let instance = self.check_instance(instance.clone(), &signature)?;
+                    self.add_instance(name.clone(), instance.into(), signature)
                 }
             }?;
         }