Add a conversion from our high-level IR to a lower-level one.

src/errors.rs

@@ -159,17 +159,15 @@ impl From<Error> for Diagnostic<usize> {
             },
 
             Error::UnboundVariable(location, name) => match location {
-                Location::Manufactured => Diagnostic::error().with_message(format!(
-                    "Unbound variable '{}'",
-                    name
-                )),
+                Location::Manufactured => {
+                    Diagnostic::error().with_message(format!("Unbound variable '{}'", name))
+                }
                 Location::InFile(file_id, offset) => Diagnostic::error()
                     .with_labels(vec![
                         Label::primary(*file_id, *offset..*offset).with_message("unbound here")
                     ])
                     .with_message(format!("Unbound variable '{}'", name)),
-
-            }
+            },
         }
     }
 }