[svn r77] Fixed foreach on slice.

Fixed some nested function problems when accessing outer function parameters.
Major changes to handling of structs.
Initial support for unions.
Probably more...

test/bug41.d

@@ -0,0 +1,10 @@
+module bug41;
+
+void main()
+{
+    char[] a = "hello world";
+    char* ap = a.ptr;
+    size_t i = 5;
+    char[] b = ap[0..i];
+    assert(b == "hello");
+}

test/d.d

@@ -1,9 +1,8 @@
 module d;
-/*
+
 void main()
 {
     int delegate() dg;
-    int i = dg();
 
     struct S
     {
@@ -19,17 +18,19 @@ void main()
 
     S s;
     auto dg2 = &s.func;
-    i = dg2();
+    int i = dg2();
+    assert(i == 42);
 
     i = f(dg2, 1);
+    assert(i == 43);
 }
 
 int f(int delegate() dg, int i)
 {
     return dg() + i;
 }
-*/
 
+/*
 struct S
 {
     int i;
@@ -46,3 +47,4 @@ void main()
 {
     auto dg = &s.square;
 }
+*/

test/foreach7.d

@@ -0,0 +1,12 @@
+module foreach7;
+
+void main()
+{
+    int[4] a = [1,2,3,4];
+    int i;
+    foreach(v; a[0..3])
+    {
+        i += v;
+    }
+    assert(i == 6);
+}

test/nested4.d

@@ -0,0 +1,12 @@
+module nested4;
+
+void func(void delegate() dg) {
+  auto v = (){
+    dg();
+  };
+}
+
+void main()
+{
+    func({});
+}

test/structs4.d

@@ -22,5 +22,5 @@ void main()
     s.t.b = 4;
     s.t.u = U.init;
     s.t.u.c = 5;
-    {assert(s.t.u.c == 5);}
+    //{assert(s.t.u.c == 5);}
 }

test/union1.d

@@ -0,0 +1,15 @@
+module union1;
+
+pragma(LLVM_internal, "notypeinfo")
+union U
+{
+    float f;
+    int i;
+}
+
+void main()
+{
+    float f = 2;
+    U u = U(f);
+    assert(u.i == *cast(int*)&f);
+}

test/union2.d

@@ -0,0 +1,17 @@
+module union2;
+
+pragma(LLVM_internal, "notypeinfo")
+union U
+{
+    float f;
+    long l;
+}
+
+U u;
+
+void main()
+{
+    assert(u.f !<>= 0);
+    uint* p = 1 + cast(uint*)&u.l;
+    assert(*p == 0);
+}

test/union3.d

@@ -0,0 +1,14 @@
+module union3;
+
+pragma(LLVM_internal, "notypeinfo")
+union vec3
+{
+    struct { float x,y,z; }
+    float[3] xyz;
+}
+
+void main()
+{
+    vec3 v;
+    assert(&v.y is &v.xyz[1]);
+}