1 files changed, 18 insertions, 0 deletions

diff --git a/subprojects/language/src/main/java/tools/refinery/language/typesystem/FixedType.java b/subprojects/language/src/main/java/tools/refinery/language/typesystem/FixedType.java
new file mode 100644
index 00000000..1b2ded48
--- /dev/null
+++ b/subprojects/language/src/main/java/tools/refinery/language/typesystem/FixedType.java
@@ -0,0 +1,18 @@
+/*
+ * SPDX-FileCopyrightText: 2024 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package tools.refinery.language.typesystem;
+
+public sealed interface FixedType extends ExprType permits NodeType, LiteralType, InvalidType, DataExprType {
+        @Override
+        default FixedType getActualType() {
+                return this;
+        }
+
+        @Override
+        default FixedType unwrapIfSet() {
+                return this;
+        }
+}