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diff --git a/tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/MemoryLeakExperiment.java b/tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/MemoryLeakExperiment.java
new file mode 100644
index 000000000..76cd51e90
--- /dev/null
+++ b/tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/MemoryLeakExperiment.java
@@ -0,0 +1,74 @@
+package org.simantics.scl.compiler.tests;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.simantics.scl.compiler.environment.specification.EnvironmentSpecification;
+import org.simantics.scl.compiler.errors.CompilationErrorFormatter;
+import org.simantics.scl.compiler.module.repository.ImportFailure;
+import org.simantics.scl.compiler.module.repository.ImportFailureException;
+import org.simantics.scl.compiler.module.repository.ModuleRepository;
+import org.simantics.scl.compiler.runtime.RuntimeEnvironment;
+import org.simantics.scl.compiler.top.ExpressionEvaluator;
+import org.simantics.scl.compiler.top.SCLExpressionCompilationException;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.Types;
+
+public class MemoryLeakExperiment {
+    ModuleRepository moduleRepository;
+
+    EnvironmentSpecification environmentSpecification;
+
+    @Before
+    public void initialize() throws Exception {
+        moduleRepository = InitialRepository.getInitialRepository();
+
+        // Environment for compiling expressions
+        environmentSpecification = new EnvironmentSpecification();
+        environmentSpecification.importModule("Builtin", "");
+        environmentSpecification.importModule("Prelude", "");
+    }
+
+    private void testExpression0(String expressionText,
+            Object expectedValue,
+            Type expectedType) throws Exception {
+        
+        RuntimeEnvironment runtimeEnvironment;
+        try {
+            runtimeEnvironment = moduleRepository.createRuntimeEnvironment(environmentSpecification,
+                    getClass().getClassLoader());
+        } catch(ImportFailureException e) {
+            for(ImportFailure failure : e.failures)
+                System.err.println("Failed to import " + failure.moduleName);
+            throw e;
+        }
+
+        // Compiling and running expression
+        try {
+            Object result = new ExpressionEvaluator(runtimeEnvironment, expressionText)
+                    .expectedType(expectedType)
+                    .interpretIfPossible(false)
+                    .eval();
+            if(expectedValue != null)
+                Assert.assertEquals(expectedValue, result);
+        } catch(SCLExpressionCompilationException e) {
+            System.out.println(CompilationErrorFormatter.toString(expressionText, e.getErrors()));
+            throw e;
+        }
+    }
+
+    @Test
+    public void testIt() throws Exception {
+        for(int i=0;i<1000000;++i) {
+            testExpression0("fst (\"a\", \"b\")", "a", Types.STRING);
+            if(i % 10000 == 0 && i > 0) {
+                System.gc();
+                System.runFinalization();
+                System.gc();
+                Thread.sleep(100L);
+                double used = (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory());
+                System.out.println(i + " " + used*1e-6 + " Mb, " + (used / i) + " b / expression");
+            }
+        }
+    }
+}