1 files changed, 5 insertions, 4 deletions
diff --git a/src/main/java/org/shedlang/compiler/typechecker/TypeChecker.java b/src/main/java/org/shedlang/compiler/typechecker/TypeChecker.java
index cff54be0..223323d3 100644
--- a/src/main/java/org/shedlang/compiler/typechecker/TypeChecker.java
+++ b/src/main/java/org/shedlang/compiler/typechecker/TypeChecker.java
@@ -401,20 +401,21 @@ public class TypeChecker {
         var typeSubstitutionMap = argsResult.value().typeSubstitutionMap;
         context = argsResult.context();
 
-        var receiverHasEffects = !receiverType.effect().equals(Effects.NONE);
+        var receiverEffect = TypeSubstitution.substituteEffect(receiverType.effect(), typeSubstitutionMap);
+        var receiverHasEffects = !receiverEffect.equals(Effects.NONE);
 
         if (receiverHasEffects && !untyped.hasEffects()) {
-            throw new CallIsMissingEffectsError(receiverType.effect(), untyped.source());
+            throw new CallIsMissingEffectsError(receiverEffect, untyped.source());
         }
 
         if (!receiverHasEffects && untyped.hasEffects()) {
             throw new FunctionHasNoEffectsError(untyped.source());
         }
 
-        if (!isSubEffect(receiverType.effect(), context.effect(), context.toTypeInfos())) {
+        if (!isSubEffect(receiverEffect, context.effect(), context.toTypeInfos())) {
             throw new UnexpectedEffectError(
                 context.effect(),
-                receiverType.effect(),
+                receiverEffect,
                 untyped.source()
             );
         }