Refactor printer

Avoids stupid stack overflows when adding variants, gets precedences
right, and updates to latest grammar changes

1 files changed, 2 insertions, 2 deletions

diff --git a/dhall_core/src/label.rs b/dhall_core/src/label.rs
index 8b371af..9dc2816 100644
--- a/dhall_core/src/label.rs
+++ b/dhall_core/src/label.rs
@@ -18,8 +18,8 @@ impl<'a> From<&'a str> for Label {
     }
 }
 
-impl From<Label> for String {
-    fn from(x: Label) -> String {
+impl From<&Label> for String {
+    fn from(x: &Label) -> String {
         x.0.as_ref().to_owned()
     }
 }