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-rw-r--r--src/main/java/org/shedlang/compiler/types/TypeSubstitution.java6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/main/java/org/shedlang/compiler/types/TypeSubstitution.java b/src/main/java/org/shedlang/compiler/types/TypeSubstitution.java
index f3a75936..7bb79124 100644
--- a/src/main/java/org/shedlang/compiler/types/TypeSubstitution.java
+++ b/src/main/java/org/shedlang/compiler/types/TypeSubstitution.java
@@ -12,8 +12,10 @@ public class TypeSubstitution {
map.substituteEffect(effectParam);
case EffectUnion effectUnion ->
- // TODO: recurse
- effect;
+ Effects.union(
+ substituteEffect(effectUnion.left(), map),
+ substituteEffect(effectUnion.right(), map)
+ );
case IoEffect ioEffect ->
effect;