v.parser: add a test for db46ad5

vlib/v/tests/calling_module_functions_with_maps_of_arrays_test.v

@@ -0,0 +1,10 @@
+import json
+
+fn test_calling_functions_with_map_initializations_containing_arrays() {
+	result := json.encode(map{
+		// NB: []string{} should NOT be treated as []json.string{}
+		'users':  []string{}
+		'groups': []string{}
+	})
+	assert result == '{"users":[],"groups":[]}'
+}