Retain order of structs

1 files changed, 5 insertions, 3 deletions

diff --git a/src/main/java/org/shedlang/compiler/typechecker/TypeInfos.java b/src/main/java/org/shedlang/compiler/typechecker/TypeInfos.java
index 5e6d6ee0..5dc01ae7 100644
--- a/src/main/java/org/shedlang/compiler/typechecker/TypeInfos.java
+++ b/src/main/java/org/shedlang/compiler/typechecker/TypeInfos.java
@@ -1,21 +1,23 @@
 package org.shedlang.compiler.typechecker;
 
 import org.pcollections.Empty;
+import org.pcollections.OrderedPMap;
 import org.pcollections.PMap;
 import org.shedlang.compiler.types.*;
+import org.shedlang.compiler.util.P;
 
 import java.util.Optional;
 
 public class TypeInfos {
-    public static final TypeInfos EMPTY = new TypeInfos(Empty.map(), Empty.map(), Empty.map());
+    public static final TypeInfos EMPTY = new TypeInfos(Empty.map(), P.orderedPMap(), Empty.map());
 
     private final PMap<NamespaceName, NamespaceTypeInfo> namespaceTypeInfos;
-    private final PMap<StructType, StructTypeInfo> structTypeInfos;
+    private final OrderedPMap<StructType, StructTypeInfo> structTypeInfos;
     private final PMap<SumType, SumTypeInfo> sumTypeInfos;
 
     public TypeInfos(
         PMap<NamespaceName, NamespaceTypeInfo> namespaceTypeInfos,
-        PMap<StructType, StructTypeInfo> structTypeInfos,
+        OrderedPMap<StructType, StructTypeInfo> structTypeInfos,
         PMap<SumType, SumTypeInfo> sumTypeInfos
     ) {
         this.namespaceTypeInfos = namespaceTypeInfos;