Tests for C nested classes symbol table not being in global space

Tests for 55bda53145

Examples/test-suite/nested_extend_c.i

@@ -0,0 +1,74 @@
+%module nested_extend_c
+
+%extend hiA {
+  hiA() {
+   union hiA *self = (union hiA *)malloc(sizeof(union hiA));
+   self->c = 'h';
+   return self;
+  }
+  char hi_extend() {
+    return $self->c;
+  }
+}
+%extend lowA {
+  lowA() {
+    struct lowA *self = (struct lowA *)malloc(sizeof(struct lowA));
+    self->name = 0;
+    self->num = 99;
+    return self;
+  }
+  int low_extend() {
+    return $self->num;
+  }
+}
+
+%extend hiB {
+  hiB() {
+   union hiB *self = (union hiB *)malloc(sizeof(union hiB));
+   self->c = 'h';
+   return self;
+  }
+  char hi_extend() {
+    return $self->c;
+  }
+}
+%extend lowB {
+  lowB() {
+    struct lowB *self = (struct lowB *)malloc(sizeof(struct lowB));
+    self->name = 0;
+    self->num = 99;
+    return self;
+  }
+  int low_extend() {
+    return $self->num;
+  }
+}
+
+%inline %{
+typedef struct NestedA {
+    int a;
+    union hiA {
+        char c;
+        int d;
+    } hiA_instance;
+
+    struct lowA {
+        char *name;
+        int num;
+    } lowA_instance;
+} NestedA;
+
+typedef struct {
+    int a;
+    union hiB {
+        char c;
+        int d;
+    } hiB_instance;
+
+    struct lowB {
+        char *name;
+        int num;
+    } lowB_instance;
+} NestedB;
+%}
+