Add a test to validate druntime's trace code, see also dlang/druntime#58

test/runnable/testprofile.d

@@ -0,0 +1,31 @@
+// REQUIRED_ARGS: -profile
+
+module testprofile;
+
+// ------------------
+
+struct FourUShort {
+    this(ushort a, ushort b, ushort c, ushort d) {
+        this.a = a;
+        this.b = b;
+        this.c = c;
+        this.d = d;
+    }
+    ushort a, b, c, d;
+}
+
+void test1()
+{
+    auto f = FourUShort(0, 1, 2, 3);
+    assert(f.a == 0);
+    assert(f.b == 1);
+    assert(f.c == 2);
+    assert(f.d == 3);
+}
+
+// ------------------
+
+void main()
+{
+    test1();
+}