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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/modules/TypeConstructor.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/modules/TypeConstructor.java
new file mode 100644
index 000000000..e3adf5ba8
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/modules/TypeConstructor.java
@@ -0,0 +1,73 @@
+package org.simantics.scl.compiler.elaboration.modules;
+
+import java.util.ArrayList;
+
+import org.cojen.classfile.TypeDesc;
+import org.simantics.scl.compiler.common.datatypes.Constructor;
+import org.simantics.scl.compiler.internal.codegen.types.JavaTypeTranslator;
+import org.simantics.scl.compiler.types.TCon;
+import org.simantics.scl.compiler.types.TVar;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.Types;
+import org.simantics.scl.compiler.types.kinds.KArrow;
+import org.simantics.scl.compiler.types.kinds.Kind;
+import org.simantics.scl.compiler.types.kinds.Kinds;
+
+public abstract class TypeConstructor {
+    public Kind kind;
+    
+    public TCon name;
+    public TVar[] parameters;
+    public Type type;
+    
+    public Constructor[] constructors = Constructor.EMPTY_ARRAY;
+    public String documentation;
+    
+    /**
+     * A data type is open if it can be constructed without
+     * constructors listed above.
+     */
+    public boolean isOpen = true;
+    
+    public TypeConstructor(Kind kind) {
+        this.kind = kind;
+    }
+    
+    public TypeConstructor(TCon name, Kind kind) {
+        this.name = name;
+        this.kind = kind;
+        
+        ArrayList<TVar> vars = new ArrayList<TVar>(2);
+        for(Kind cur = kind; cur instanceof KArrow;) {
+            KArrow arrow = (KArrow)cur;
+            vars.add(Types.var(arrow.domain));
+            cur = arrow.range;
+        }
+        this.parameters = vars.toArray(new TVar[vars.size()]);
+        this.type = Types.apply(name, parameters);
+    }
+    
+    public TypeConstructor(TCon name, TVar ... parameters) {
+        setType(name, parameters);
+        Kind kind = Kinds.STAR;
+        for(int i = parameters.length-1;i>=0;--i)
+            kind = Kinds.arrow(parameters[i].getKind(), kind);
+        this.kind = kind;
+    }
+    
+    public void setType(TCon name, TVar ... parameters) {
+        this.name = name;
+        this.parameters = parameters;
+        this.type = Types.apply(name, parameters);
+    }
+    
+    public void setConstructors(Constructor ... constructors) {
+        this.constructors = constructors;
+    }
+
+    public abstract TypeDesc construct(JavaTypeTranslator translator, Type[] parameters);
+
+    public void setDocumentation(String documentation) {
+        this.documentation = documentation;
+    }
+}