Implement parsing of `toMap` keyword

3 files changed, 13 insertions, 0 deletions

diff --git a/dhall/src/phase/binary.rs b/dhall/src/phase/binary.rs
index 7dc9be2..40219d9 100644
--- a/dhall/src/phase/binary.rs
+++ b/dhall/src/phase/binary.rs
@@ -366,6 +366,15 @@ fn cbor_value_to_dhall(data: &cbor::Value) -> Result<DecodedExpr, DecodeError> {
                 let y = cbor_value_to_dhall(&y)?;
                 Annot(x, y)
             }
+            [U64(27), x] => {
+                let x = cbor_value_to_dhall(&x)?;
+                ToMap(x, None)
+            }
+            [U64(27), x, y] => {
+                let x = cbor_value_to_dhall(&x)?;
+                let y = cbor_value_to_dhall(&y)?;
+                ToMap(x, Some(y))
+            }
             [U64(28), x] => {
                 let x = cbor_value_to_dhall(&x)?;
                 EmptyListLit(x)
@@ -550,6 +559,8 @@ where
         Merge(x, y, Some(z)) => {
             ser_seq!(ser; tag(6), expr(x), expr(y), expr(z))
         }
+        ToMap(x, None) => ser_seq!(ser; tag(27), expr(x)),
+        ToMap(x, Some(y)) => ser_seq!(ser; tag(27), expr(x), expr(y)),
         Projection(x, ls) => ser.collect_seq(
             once(tag(10))
                 .chain(once(expr(x)))
diff --git a/dhall/src/phase/normalize.rs b/dhall/src/phase/normalize.rs
index 82a378c..3f6e99c 100644
--- a/dhall/src/phase/normalize.rs
+++ b/dhall/src/phase/normalize.rs
@@ -765,6 +765,7 @@ pub(crate) fn normalize_one_layer(
                 }
             }
         }
+        ExprF::ToMap(_, _) => unimplemented!("toMap"),
     };
 
     match ret {
diff --git a/dhall/src/phase/typecheck.rs b/dhall/src/phase/typecheck.rs
index 52a4e47..9013c1f 100644
--- a/dhall/src/phase/typecheck.rs
+++ b/dhall/src/phase/typecheck.rs
@@ -757,6 +757,7 @@ fn type_last_layer(
                 (None, None) => return mkerr(MergeEmptyNeedsAnnotation),
             }
         }
+        ToMap(_, _) => unimplemented!("toMap"),
         Projection(record, labels) => {
             let record_type = record.get_type()?;
             let record_borrow = record_type.as_whnf();