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/parser.rs b/dhall_core/src/parser.rs
index a62f861..3f53c49 100644
--- a/dhall_core/src/parser.rs
+++ b/dhall_core/src/parser.rs
@@ -685,7 +685,7 @@ make_parser! {
 
     rule!(identifier<ParsedExpr> as expression; children!(
         [label(l), natural_literal(idx)] => {
-            let name = String::from(l.clone());
+            let name = String::from(&l);
             match Builtin::parse(name.as_str()) {
                 Some(b) => bx(Expr::Builtin(b)),
                 None => match name.as_str() {
@@ -698,7 +698,7 @@ make_parser! {
             }
         },
         [label(l)] => {
-            let name = String::from(l.clone());
+            let name = String::from(&l);
             match Builtin::parse(name.as_str()) {
                 Some(b) => bx(Expr::Builtin(b)),
                 None => match name.as_str() {