Chapter 10a: Structs and Memorylinear-chapter10a

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diff --git a/src/test/java/com/seaofnodes/simple/SchedulerTest.java b/src/test/java/com/seaofnodes/simple/SchedulerTest.java
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+++ b/src/test/java/com/seaofnodes/simple/SchedulerTest.java
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+package com.seaofnodes.simple;
+
+import com.seaofnodes.simple.evaluator.Evaluator;
+import com.seaofnodes.simple.node.StopNode;
+import org.junit.Assert;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class SchedulerTest {
+
+    private static void assertObj(Object obj, String name, Object... fields) {
+        assertEquals(Evaluator.Obj.class, obj.getClass());
+        var o = (Evaluator.Obj)obj;
+        assertEquals(name, o.struct()._name);
+        Assert.assertArrayEquals(fields, o.fields());
+    }
+
+    @Test
+    @Ignore
+    public void testJig() {
+        Parser parser = new Parser("""
+struct S {
+    int f;
+}
+S v=new S;
+v.f = 2;
+int i=v.f;
+if (arg) v.f=1;
+return i;
+""");
+        StopNode stop = parser.parse();//.iterate();
+        var eval = new Evaluator(stop);
+        assertEquals(2L, eval.evaluate(1, 10));
+    }
+
+    @Test
+    public void testStoreInIf() {
+        Parser parser = new Parser("""
+struct S {
+    int f;
+}
+S v0=new S;
+if(arg) v0.f=1;
+return v0;
+""");
+        StopNode stop = parser.parse().iterate();
+        var eval = new Evaluator(stop);
+        assertObj(eval.evaluate(0, 10), "S", 0L);
+        assertObj(eval.evaluate(1, 10), "S", 1L);
+    }
+
+    @Test
+    public void testStoreInIf2() {
+        Parser parser = new Parser("""
+struct S {
+    int f;
+}
+S v=new S;
+v.f = 2;
+int i=new S.f;
+i=v.f;
+if (arg) v.f=1;
+return i;
+""");
+        StopNode stop = parser.parse().iterate();
+        var eval = new Evaluator(stop);
+        assertEquals(2L, eval.evaluate(0, 10));
+        assertEquals(2L, eval.evaluate(1, 10));
+    }
+
+}