Check params can have trailing comma

1 files changed, 20 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/parser/ParserFunctionDefinitionTests.java b/src/test/java/org/shedlang/compiler/parser/ParserFunctionDefinitionTests.java
index 607a06bf..c9961426 100644
--- a/src/test/java/org/shedlang/compiler/parser/ParserFunctionDefinitionTests.java
+++ b/src/test/java/org/shedlang/compiler/parser/ParserFunctionDefinitionTests.java
@@ -147,6 +147,26 @@ public class ParserFunctionDefinitionTests {
     }
 
     @Test
+    public void paramsCanHaveTrailingComma() {
+        var source = """
+            fun f(a: Int, ) -> Unit {
+            }""";
+
+        var node = parseString(source, Parser::parseNamespaceStatement);
+
+        assertThat(
+            node,
+            isUntypedFunctionDefinitionNode()
+                .withParams(isUntypedParamsNode(
+                    isSequence(
+                        isUntypedParamNode("a", isUntypedTypeLevelReferenceNode("Int"))
+                    ),
+                    isSequence()
+                ))
+        );
+    }
+
+    @Test
     public void canParseFunctionWithEffect() {
         var source = """
             fun f() ! Io -> Unit {