3 files changed, 3 insertions, 0 deletions
diff --git a/dhall_syntax/src/core/expr.rs b/dhall_syntax/src/core/expr.rs
index aab4b6a..b293357 100644
--- a/dhall_syntax/src/core/expr.rs
+++ b/dhall_syntax/src/core/expr.rs
@@ -119,6 +119,7 @@ pub enum Builtin {
     NaturalOdd,
     NaturalToInteger,
     NaturalShow,
+    NaturalSubtract,
     IntegerToDouble,
     IntegerShow,
     DoubleShow,
diff --git a/dhall_syntax/src/parser.rs b/dhall_syntax/src/parser.rs
index a7f419a..72dfcdd 100644
--- a/dhall_syntax/src/parser.rs
+++ b/dhall_syntax/src/parser.rs
@@ -80,6 +80,7 @@ impl crate::Builtin {
             "Natural/odd" => Some(NaturalOdd),
             "Natural/toInteger" => Some(NaturalToInteger),
             "Natural/show" => Some(NaturalShow),
+            "Natural/subtract" => Some(NaturalSubtract),
             "Integer/toDouble" => Some(IntegerToDouble),
             "Integer/show" => Some(IntegerShow),
             "Double/show" => Some(DoubleShow),
diff --git a/dhall_syntax/src/printer.rs b/dhall_syntax/src/printer.rs
index db688bd..1d6c113 100644
--- a/dhall_syntax/src/printer.rs
+++ b/dhall_syntax/src/printer.rs
@@ -449,6 +449,7 @@ impl Display for Builtin {
             NaturalOdd => "Natural/odd",
             NaturalToInteger => "Natural/toInteger",
             NaturalShow => "Natural/show",
+            NaturalSubtract => "Natural/subtract",
             IntegerToDouble => "Integer/toDouble",
             IntegerShow => "Integer/show",
             DoubleShow => "Double/show",