Update dhall-lang submodule

2 files changed, 10 insertions, 1 deletions

diff --git a/dhall/src/error/mod.rs b/dhall/src/error/mod.rs
index 1288c12..40cccac 100644
--- a/dhall/src/error/mod.rs
+++ b/dhall/src/error/mod.rs
@@ -76,6 +76,7 @@ pub(crate) enum TypeMessage {
     MergeHandlerReturnTypeMustNotBeDependent,
     ProjectionMustBeRecord,
     ProjectionMissingEntry,
+    ProjectionDuplicateField,
     Sort,
     RecordTypeDuplicateField,
     RecordTypeMergeRequiresRecordType(Value),
diff --git a/dhall/src/semantics/phase/typecheck.rs b/dhall/src/semantics/phase/typecheck.rs
index c439f74..856f5c3 100644
--- a/dhall/src/semantics/phase/typecheck.rs
+++ b/dhall/src/semantics/phase/typecheck.rs
@@ -774,7 +774,15 @@ fn type_last_layer(
             for l in labels {
                 match kts.get(l) {
                     None => return mkerr(ProjectionMissingEntry),
-                    Some(t) => new_kts.insert(l.clone(), t.clone()),
+                    Some(t) => {
+                        use std::collections::hash_map::Entry;
+                        match new_kts.entry(l.clone()) {
+                            Entry::Occupied(_) => {
+                                return mkerr(ProjectionDuplicateField)
+                            }
+                            Entry::Vacant(e) => e.insert(t.clone()),
+                        }
+                    }
                 };
             }