Chapter 17a: Mutability and Read-Only Viewslinear-chapter17a

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diff --git a/src/test/java/com/seaofnodes/simple/Chapter17aTest.java b/src/test/java/com/seaofnodes/simple/Chapter17aTest.java
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+package com.seaofnodes.simple;
+
+import com.seaofnodes.simple.evaluator.Evaluator;
+import com.seaofnodes.simple.node.StopNode;
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+public class Chapter17aTest {
+
+    @Test
+    public void testFinal1() {
+        Parser parser = new Parser(
+"""
+int x=2, y=3;
+if( arg ) { int x = y; x = x*x; y=x; } // Shadow final x
+return y;
+""");
+        StopNode stop = parser.parse().iterate();
+        assertEquals("return Phi(Region,9,3);", stop.toString());
+        assertEquals(3L, Evaluator.evaluate(stop, 0));
+        assertEquals(9L, Evaluator.evaluate(stop, 1));
+    }
+
+    @Test
+    public void testConstruct1() {
+        Parser parser = new Parser("""
+struct X { int ~x; };
+X z = new X { x=3; };
+return z.x;
+""");
+        StopNode stop = parser.parse().iterate();
+        assertEquals("return 3;", stop.toString());
+        assertEquals(3L, Evaluator.evaluate(stop,  0));
+    }
+
+    @Test
+    public void testStructFinal0() {
+        Parser parser = new Parser("""
+struct Point { int ~x, ~y; };
+Point p = new Point { x=3; y=4; };
+return p;
+""");
+        StopNode stop = parser.parse().iterate();
+        assertEquals("return (const)Point;", stop.toString());
+        assertEquals("Obj<Point>{x=3,y=4}", Evaluator.evaluate(stop,  0).toString());
+    }
+
+    @Test
+    public void testStructFinal1() {
+        Parser parser = new Parser("""
+struct Point { int x=3, y=4; };
+Point p = new Point { x=5; y=6; };
+p.x=p.x+1;
+return p;
+""");
+        try { parser.parse().iterate(); fail(); }
+        catch( Exception e ) { assertEquals("Cannot modify final field 'x'",e.getMessage()); }
+    }
+
+    @Test
+    public void testStructFinal2() {
+        Parser parser = new Parser("""
+struct Point { int x=3, y=4; };
+Point p = new Point;
+p.x=p.x+1;
+return p;
+""");
+        try { parser.parse().iterate(); fail(); }
+        catch( Exception e ) { assertEquals("Cannot modify final field 'x'",e.getMessage()); }
+    }
+
+    @Test
+    public void testStructFinal3() {
+        for( String fields : new String[] { "int ~x; int ~y;", "int[] !x;", "int[] !x;" } ) {
+            String src = "struct Point { "+fields+" }; Point p = new Point; p.x=p.x+1; return p;";
+            try { new Parser(src).parse().iterate(); fail(fields); }
+            catch( Exception e ) { assertEquals("'Point' is not fully initialized, field 'x' needs to be set in a constructor",e.getMessage()); }
+        }
+    }
+
+    @Test
+    public void testStructFinal4() {
+        Parser parser = new Parser("""
+struct Point { int ~x=3; int ~y=4; };
+Point p = new Point;
+p.x=p.x+1;
+return p;
+""");
+        try { parser.parse().iterate(); fail(); }
+        catch( Exception e ) { assertEquals("Cannot modify final field 'x'",e.getMessage()); }
+    }
+
+    @Test
+    public void testStructFinal5() {
+        Parser parser = new Parser("""
+struct Point { int x=3; int y=4; };
+!Point !p = new Point;
+p.x=p.x+1;
+return p;
+""");
+        StopNode stop = parser.parse().iterate();
+        assertEquals("return Point;", stop.toString());
+        assertEquals("Obj<Point>{x=4,y=4}", Evaluator.evaluate(stop,  0).toString());
+    }
+
+}