diff --git a/elab_expr.cc b/elab_expr.cc
index 530f47b7e..41ac7bec6 100644
--- a/elab_expr.cc
+++ b/elab_expr.cc
@@ -4377,6 +4377,7 @@ NetExpr* PEIdent::elaborate_expr(Design*des, NetScope*scope,
 		 << "Found net " << net->name() << " for expr " << *this << endl;
       }
 
+      ivl_type_t check_type = ntype;
       if (const netdarray_t*array_type = dynamic_cast<const netdarray_t*> (ntype)) {
             if (array_type->type_compatible(net->net_type())) {
                   NetESignal*tmp = new NetESignal(net);
@@ -4386,10 +4387,10 @@ NetExpr* PEIdent::elaborate_expr(Design*des, NetScope*scope,
 
               // Icarus allows a dynamic array to be initialised with a
               // single elementary value, so try that next.
-	    ntype = array_type->element_type();
+	    check_type = array_type->element_type();
       }
 
-      if (! ntype->type_compatible(net->net_type())) {
+      if (! check_type->type_compatible(net->net_type())) {
 	    cerr << get_fileline() << ": error: the type of the variable '"
 		 << path_ << "' doesn't match the context type." << endl;
 
diff --git a/ivl.def b/ivl.def
index 7c781eed4..81d9ae853 100644
--- a/ivl.def
+++ b/ivl.def
@@ -328,6 +328,7 @@ ivl_type_name
 ivl_type_packed_dimensions
 ivl_type_packed_lsb
 ivl_type_packed_msb
+ivl_type_packed_width
 ivl_type_prop_name
 ivl_type_prop_type
 ivl_type_properties
diff --git a/ivl_target.h b/ivl_target.h
index 6afde3c27..fdbb9a8f6 100644
--- a/ivl_target.h
+++ b/ivl_target.h
@@ -2348,6 +2348,9 @@ extern unsigned ivl_switch_lineno(ivl_switch_t net);
  *    Return the type of the element of an array. This is only valid
  *    for array types.
  *
+ * ivl_type_packed_width
+ *    Returns the total width of all packed dimensions.
+ *
  * ivl_type_signed
  *    Return TRUE if the type represents a signed packed vector or
  *    signed atomic type, and FALSE otherwise.
@@ -2361,6 +2364,7 @@ extern ivl_type_t ivl_type_element(ivl_type_t net);
 extern unsigned ivl_type_packed_dimensions(ivl_type_t net);
 extern int ivl_type_packed_lsb(ivl_type_t net, unsigned dim);
 extern int ivl_type_packed_msb(ivl_type_t net, unsigned dim);
+extern unsigned ivl_type_packed_width(ivl_type_t net);
 extern int ivl_type_signed(ivl_type_t net);
 extern const char* ivl_type_name(ivl_type_t net);
 extern int         ivl_type_properties(ivl_type_t net);
diff --git a/ivtest/ivltests/sv_darray_assign1.v b/ivtest/ivltests/sv_darray_assign1.v
new file mode 100644
index 000000000..b31e24214
--- /dev/null
+++ b/ivtest/ivltests/sv_darray_assign1.v
@@ -0,0 +1,28 @@
+// Check that dynamic arrays with compatible packed base types can be assigned
+// to each other. Even if the element types are not identical.
+
+module test;
+
+  typedef bit [31:0] T1;
+  typedef bit [31:0] T2[];
+
+  // For two packed types to be compatible they need to have the same packed
+  // width, both be 2-state or 4-state and both be either signed or unsigned.
+  bit [32:1] d1[];
+  bit [7:0][3:0] d2[];
+  int unsigned d3[];
+  T1 d4[];
+  T2 d5;
+
+  initial begin
+    d1 = new[1];
+    d2 = d1;
+    d3 = d2;
+    d4 = d3;
+    d5 = d4;
+    d1 = d5;
+
+    $display("PASSED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_darray_assign2.v b/ivtest/ivltests/sv_darray_assign2.v
new file mode 100644
index 000000000..f3e7a78e4
--- /dev/null
+++ b/ivtest/ivltests/sv_darray_assign2.v
@@ -0,0 +1,44 @@
+// Check that dynamic arrays with compatible packed base types can be passed as
+// task arguments. Even it the element types are not identical.
+
+module test;
+
+  typedef logic [31:0] T[];
+
+  task t1(logic [31:0] d[]);
+    d[0] = 1;
+  endtask
+
+  task t2(logic [7:0][3:0] d[]);
+    d[0] = 1;
+  endtask
+
+  task t3([31:0] d[]);
+    d[0] = 1;
+  endtask
+
+  task t4(T d);
+    d[0] = 1;
+  endtask
+
+  // For two packed types to be compatible they need to have the same packed
+  // width, both be 2-state or 4-state and both be either signed or unsigned.
+  logic [31:0] d1[];
+  logic [7:0][3:0] d2[];
+
+  initial begin
+    d1 = new[1];
+    d2 = new[1];
+    t1(d1);
+    t1(d2);
+    t2(d1);
+    t2(d2);
+    t3(d1);
+    t3(d2);
+    t4(d1);
+    t4(d2);
+
+    $display("PASSED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_darray_assign_fail1.v b/ivtest/ivltests/sv_darray_assign_fail1.v
new file mode 100644
index 000000000..33699b1b1
--- /dev/null
+++ b/ivtest/ivltests/sv_darray_assign_fail1.v
@@ -0,0 +1,15 @@
+// Check that it is not possible to assign a dynamic array with a 2-state
+// element type to a dynamic array with 4-state element type. Even if they are
+// otherwise identical.
+
+module test;
+
+  logic [31:0] d1[];
+  bit [31:0] d2[];
+
+  initial begin
+    d1 = d2;
+    $dispaly("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_darray_assign_fail2.v b/ivtest/ivltests/sv_darray_assign_fail2.v
new file mode 100644
index 000000000..cda58dfb3
--- /dev/null
+++ b/ivtest/ivltests/sv_darray_assign_fail2.v
@@ -0,0 +1,15 @@
+// Check that it is not possible to assign a dynamic array with a signed element
+// type to a dynamic array with a unsigned element type. Even if they are
+// otherwise identical.
+
+module test;
+
+  logic [31:0] d1[];
+  logic signed [31:0] d2[];
+
+  initial begin
+    d1 = d2;
+    $dispaly("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_darray_assign_fail3.v b/ivtest/ivltests/sv_darray_assign_fail3.v
new file mode 100644
index 000000000..e5ac046cf
--- /dev/null
+++ b/ivtest/ivltests/sv_darray_assign_fail3.v
@@ -0,0 +1,14 @@
+// Check that it is not possible to assign a dynamic array with different
+// element type width.
+
+module test;
+
+  int d1[];
+  shortint d2[];
+
+  initial begin
+    d1 = d2;
+    $dispaly("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_darray_assign_fail4.v b/ivtest/ivltests/sv_darray_assign_fail4.v
new file mode 100644
index 000000000..85961bac2
--- /dev/null
+++ b/ivtest/ivltests/sv_darray_assign_fail4.v
@@ -0,0 +1,17 @@
+// Check that it is not possible to assign a dynamic array with an enum
+// element type to a dynamic array with a packed type. Even if the enum base
+// type is the same as the packed type.
+
+module test;
+
+  enum logic [31:0] {
+    A
+  } d1[];
+  logic [31:0] d2[];
+
+  initial begin
+    d1 = d2;
+    $dispaly("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_darray_assign_fail5.v b/ivtest/ivltests/sv_darray_assign_fail5.v
new file mode 100644
index 000000000..a1538d0b6
--- /dev/null
+++ b/ivtest/ivltests/sv_darray_assign_fail5.v
@@ -0,0 +1,14 @@
+// Check that it is not possible to assign a dynamic array with a real
+// element type to a dynamic array with an int element type.
+
+module test;
+
+  int d1[];
+  real d2[];
+
+  initial begin
+    d1 = d2;
+    $display("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_darray_assign_fail6.v b/ivtest/ivltests/sv_darray_assign_fail6.v
new file mode 100644
index 000000000..8692e42da
--- /dev/null
+++ b/ivtest/ivltests/sv_darray_assign_fail6.v
@@ -0,0 +1,14 @@
+// Check that it is not possible to assign a dynamic array with an int
+// element type to a dynamic array with a real element type.
+
+module test;
+
+  real d1[];
+  int d2[];
+
+  initial begin
+    d1 = d2;
+    $display("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_queue_assign1.v b/ivtest/ivltests/sv_queue_assign1.v
new file mode 100644
index 000000000..fe0bb48df
--- /dev/null
+++ b/ivtest/ivltests/sv_queue_assign1.v
@@ -0,0 +1,27 @@
+// Check that queues with compatible packed base types can be assigned to each
+// other. Even if the element types are not identical.
+
+module test;
+
+  typedef bit [31:0] T1;
+  typedef bit [31:0] T2[$];
+
+  // For two packed types to be compatible they need to have the same packed
+  // width, both be 2-state or 4-state and both be either signed or unsigned.
+  bit [32:1] q1[$];
+  bit [7:0][3:0] q2[$];
+  int unsigned q3[$];
+  T1 q4[$];
+  T2 q5;
+
+  initial begin
+    q2 = q1;
+    q3 = q2;
+    q4 = q3;
+    q5 = q4;
+    q1 = q5;
+
+    $display("PASSED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_queue_assign2.v b/ivtest/ivltests/sv_queue_assign2.v
new file mode 100644
index 000000000..472bc165e
--- /dev/null
+++ b/ivtest/ivltests/sv_queue_assign2.v
@@ -0,0 +1,45 @@
+// Check that queues with compatible packed base types can be passed as task
+// arguments. Even it the element types are not identical.
+
+module test;
+
+  typedef logic [31:0] T[$];
+
+  task t1(logic [31:0] q[$]);
+    q[0] = 1;
+  endtask
+
+  task t2(logic [7:0][3:0] q[$]);
+    q[0] = 1;
+  endtask
+
+  task t3([31:0] q[$]);
+    q[0] = 1;
+  endtask
+
+  task t4(T q);
+    q[0] = 1;
+  endtask
+
+  // For two packed types to be compatible they need to have the same packed
+  // width, both be 2-state or 4-state and both be either signed or unsigned.
+  logic [31:0] q1[$];
+  logic [7:0][3:0] q2[$];
+
+  initial begin
+    q1.push_back(1);
+    q2.push_back(2);
+
+    t1(q1);
+    t1(q2);
+    t2(q1);
+    t2(q2);
+    t3(q1);
+    t3(q2);
+    t4(q1);
+    t4(q2);
+
+    $display("PASSED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_queue_assign_fail1.v b/ivtest/ivltests/sv_queue_assign_fail1.v
new file mode 100644
index 000000000..d43f6afbe
--- /dev/null
+++ b/ivtest/ivltests/sv_queue_assign_fail1.v
@@ -0,0 +1,14 @@
+// Check that it is not possible to assign a queue with a 2-state element type
+// to a queue with 4-state element type. Even if they are otherwise identical.
+
+module test;
+
+  logic [31:0] q1[$];
+  bit [31:0] q2[$];
+
+  initial begin
+    q1 = q2;
+    $dispaly("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_queue_assign_fail2.v b/ivtest/ivltests/sv_queue_assign_fail2.v
new file mode 100644
index 000000000..cab584703
--- /dev/null
+++ b/ivtest/ivltests/sv_queue_assign_fail2.v
@@ -0,0 +1,14 @@
+// Check that it is not possible to assign a queue with a signed element type to
+// a queue with a unsigned element type. Even if they are otherwise identical.
+
+module test;
+
+  logic [31:0] q1[$];
+  logic signed [31:0] q2[$];
+
+  initial begin
+    q1 = q2;
+    $dispaly("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_queue_assign_fail3.v b/ivtest/ivltests/sv_queue_assign_fail3.v
new file mode 100644
index 000000000..3d820f376
--- /dev/null
+++ b/ivtest/ivltests/sv_queue_assign_fail3.v
@@ -0,0 +1,14 @@
+// Check that it is not possible to assign a queue to another queue with a
+// different element width.
+
+module test;
+
+  int q1[$];
+  shortint q2[$];
+
+  initial begin
+    q1 = q2;
+    $dispaly("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_queue_assign_fail4.v b/ivtest/ivltests/sv_queue_assign_fail4.v
new file mode 100644
index 000000000..5df7c9ed9
--- /dev/null
+++ b/ivtest/ivltests/sv_queue_assign_fail4.v
@@ -0,0 +1,17 @@
+// Check that it is not possible to assign a queue with an enum element type to
+// a queue with a packed type. Even if the enum base type is the same as the
+// packed type.
+
+module test;
+
+  enum logic [31:0] {
+    A
+  } q1[$];
+  logic [31:0] q2[$];
+
+  initial begin
+    q1 = q2;
+    $dispaly("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_queue_assign_fail5.v b/ivtest/ivltests/sv_queue_assign_fail5.v
new file mode 100644
index 000000000..7a5b1f425
--- /dev/null
+++ b/ivtest/ivltests/sv_queue_assign_fail5.v
@@ -0,0 +1,14 @@
+// Check that it is not possible to assign a queue with a real element type to a
+// queue with an int element type.
+
+module test;
+
+  int q1[$];
+  real q2[$];
+
+  initial begin
+    q1 = q2;
+    $display("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_queue_assign_fail6.v b/ivtest/ivltests/sv_queue_assign_fail6.v
new file mode 100644
index 000000000..358533117
--- /dev/null
+++ b/ivtest/ivltests/sv_queue_assign_fail6.v
@@ -0,0 +1,14 @@
+// Check that it is not possible to assign a queue with an int element type to a
+// queue with a real element type.
+
+module test;
+
+  real q1[$];
+  int q2[$];
+
+  initial begin
+    q1 = q2;
+    $display("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/regress-sv.list b/ivtest/regress-sv.list
index ffb5691b9..e423c2a86 100644
--- a/ivtest/regress-sv.list
+++ b/ivtest/regress-sv.list
@@ -557,6 +557,14 @@ sv_darray_args2		normal,-g2009		ivltests
 sv_darray_args2b	normal,-g2009		ivltests
 sv_darray_args3		normal,-g2009		ivltests
 sv_darray_args4		normal,-g2009		ivltests
+sv_darray_assign1	normal,-g2009		ivltests
+sv_darray_assign2	normal,-g2009		ivltests
+sv_darray_assign_fail1	CE,-g2009		ivltests
+sv_darray_assign_fail2	CE,-g2009		ivltests
+sv_darray_assign_fail3	CE,-g2009		ivltests
+sv_darray_assign_fail4	CE,-g2009		ivltests
+sv_darray_assign_fail5	CE,-g2009		ivltests
+sv_darray_assign_fail6	CE,-g2009		ivltests
 sv_darray_copy_empty1	normal,-g2009		ivltests
 sv_darray_copy_empty2	normal,-g2009		ivltests
 sv_darray_copy_empty3	normal,-g2009		ivltests
@@ -628,6 +636,14 @@ sv_ps_var1		normal,-g2009		ivltests
 sv_queue1		normal,-g2009		ivltests
 sv_queue2		normal,-g2009		ivltests
 sv_queue3		normal,-g2009		ivltests
+sv_queue_assign1	normal,-g2009		ivltests
+sv_queue_assign2	normal,-g2009		ivltests
+sv_queue_assign_fail1	CE,-g2009		ivltests
+sv_queue_assign_fail2	CE,-g2009		ivltests
+sv_queue_assign_fail3	CE,-g2009		ivltests
+sv_queue_assign_fail4	CE,-g2009		ivltests
+sv_queue_assign_fail5	CE,-g2009		ivltests
+sv_queue_assign_fail6	CE,-g2009		ivltests
 sv_queue_copy_empty1	normal,-g2009		ivltests
 sv_queue_copy_empty2	normal,-g2009		ivltests
 sv_queue_function1	normal,-g2009		ivltests
diff --git a/ivtest/regress-vlog95.list b/ivtest/regress-vlog95.list
index 0fdd10572..97ad90d58 100644
--- a/ivtest/regress-vlog95.list
+++ b/ivtest/regress-vlog95.list
@@ -345,6 +345,8 @@ sv_darray_args2		CE,-g2009,-pallowsigned=1	ivltests
 sv_darray_args2b	CE,-g2009,-pallowsigned=1	ivltests
 sv_darray_args3		CE,-g2009,-pallowsigned=1	ivltests
 sv_darray_args4		CE,-g2009,-pallowsigned=1	ivltests  # Also string
+sv_darray_assign1	CE,-g2009		        ivltests
+sv_darray_assign2	CE,-g2009		        ivltests
 sv_darray_copy_empty1	CE,-g2009			ivltests
 sv_darray_copy_empty2	CE,-g2009			ivltests
 sv_darray_copy_empty3	CE,-g2009			ivltests
@@ -488,6 +490,8 @@ pr3390385b		CE,-g2009		ivltests  # ++
 pr3390385c		CE,-g2009		ivltests  # ++
 pr3390385d		CE,-g2009		ivltests  # ++
 pr3462145		CE,-g2009		ivltests  # ++
+sv_queue_assign1	CE,-g2009		        ivltests  # queue
+sv_queue_assign2	CE,-g2009		        ivltests  # queue
 sv_queue_copy_empty1	CE,-g2009			ivltests  # queue
 sv_queue_copy_empty2	CE,-g2009			ivltests  # queue
 sv_queue_function1	CE,-g2009,-pallowsigned=1	ivltests  # queue
diff --git a/netdarray.cc b/netdarray.cc
index 9456c5da3..0e45cabe8 100644
--- a/netdarray.cc
+++ b/netdarray.cc
@@ -37,18 +37,22 @@ ivl_variable_type_t netdarray_t::base_type(void) const
       return IVL_VT_DARRAY;
 }
 
-bool netdarray_t::test_compatibility(ivl_type_t that) const
+bool netdarray_t::test_equivalence(ivl_type_t that) const
 {
-      ivl_type_t elem_type = 0;
-
-      if (const netdarray_t*that_da = dynamic_cast<const netdarray_t*>(that))
-	    elem_type = that_da->element_type();
-
-      if (const netqueue_t*that_q = dynamic_cast<const netqueue_t*>(that))
-            elem_type = that_q->element_type();
-
-      if (elem_type == 0)
+      // Queues and dynamic arrays are not equivalent, so check for the base
+      // type to make sure both are either dynamic array or queue.
+      if (base_type() != that->base_type())
 	    return false;
 
-      return element_type()->type_compatible(elem_type);
+      return test_compatibility(that);
+}
+
+bool netdarray_t::test_compatibility(ivl_type_t that) const
+{
+      // This will match both queues and dynamic arrays
+      const netdarray_t *that_da = dynamic_cast<const netdarray_t*>(that);
+      if (!that_da)
+	    return false;
+
+      return element_type()->type_equivalent(that_da->element_type());
 }
diff --git a/netdarray.h b/netdarray.h
index 890995ad1..8fc466e3b 100644
--- a/netdarray.h
+++ b/netdarray.h
@@ -36,9 +36,6 @@ class netdarray_t : public netarray_t {
 	// A dynamic array may have a type that is signed.
       inline bool get_signed() const { return element_type()->get_signed(); }
 
-	// Use the packed width to pass the element width
-      long packed_width() const { return element_type()->packed_width(); }
-
 	// This is the base_type() of the element of the array. We
 	// need this in some cases in order to get the base type of
 	// the element, and not the IVL_VT_DARRAY of the array itself.
@@ -52,6 +49,7 @@ class netdarray_t : public netarray_t {
 
     private:
       bool test_compatibility(ivl_type_t that) const;
+      bool test_equivalence(ivl_type_t that) const;
 };
 
 #endif /* IVL_netdarray_H */
diff --git a/netparray.cc b/netparray.cc
index 0c0181c0c..3e6e81050 100644
--- a/netparray.cc
+++ b/netparray.cc
@@ -68,6 +68,16 @@ vector<netrange_t> netparray_t::slice_dimensions() const
       return res;
 }
 
+bool netparray_t::test_compatibility(ivl_type_t that) const
+{
+      return packed_type_compatible(that);
+}
+
+bool netparray_t::test_equivalence(ivl_type_t that) const
+{
+      return packed_types_equivalent(this, that);
+}
+
 netuarray_t::~netuarray_t()
 {
 }
diff --git a/netparray.h b/netparray.h
index 6be2da4d0..2e51bf80d 100644
--- a/netparray.h
+++ b/netparray.h
@@ -68,6 +68,9 @@ class netparray_t : public netsarray_t {
       long packed_width(void) const;
       std::vector<netrange_t> slice_dimensions() const;
 
+    private:
+      bool test_compatibility(ivl_type_t that) const;
+      bool test_equivalence(ivl_type_t that) const;
 };
 
 inline netparray_t::netparray_t(const std::vector<netrange_t>&pd,
diff --git a/netqueue.cc b/netqueue.cc
index 01e4fd082..f04bc4f36 100644
--- a/netqueue.cc
+++ b/netqueue.cc
@@ -35,19 +35,3 @@ ivl_variable_type_t netqueue_t::base_type() const
 {
       return IVL_VT_QUEUE;
 }
-
-bool netqueue_t::test_compatibility(ivl_type_t that) const
-{
-      ivl_type_t elem_type = 0;
-
-      if (const netqueue_t*that_q = dynamic_cast<const netqueue_t*>(that))
-	    elem_type = that_q->element_type();
-
-      if (const netdarray_t*that_da = dynamic_cast<const netdarray_t*>(that))
-	    elem_type = that_da->element_type();
-
-      if (elem_type == 0)
-	    return false;
-
-      return element_type()->type_compatible(elem_type);
-}
diff --git a/netqueue.h b/netqueue.h
index 1e04e4535..826893390 100644
--- a/netqueue.h
+++ b/netqueue.h
@@ -43,7 +43,6 @@ class netqueue_t : public netdarray_t {
       std::ostream& debug_dump(std::ostream&) const;
 
     private:
-      bool test_compatibility(ivl_type_t that) const;
       long max_idx_;
 };
 
diff --git a/netstruct.cc b/netstruct.cc
index e56b333a7..011a6540b 100644
--- a/netstruct.cc
+++ b/netstruct.cc
@@ -134,3 +134,16 @@ ivl_variable_type_t netstruct_t::base_type() const
 
       return IVL_VT_BOOL;
 }
+
+bool netstruct_t::test_compatibility(ivl_type_t that) const
+{
+      return packed_type_compatible(that);
+}
+
+bool netstruct_t::test_equivalence(ivl_type_t that) const
+{
+      if (!packed_)
+	    return this == that;
+
+      return packed_types_equivalent(this, that);
+}
diff --git a/netstruct.h b/netstruct.h
index 211796f06..b2ae1f96f 100644
--- a/netstruct.h
+++ b/netstruct.h
@@ -75,6 +75,10 @@ class netstruct_t : public LineInfo, public ivl_type_s {
 	// IVL_VT_NO_TYPE if the record is not packed.
       ivl_variable_type_t base_type() const;
 
+    private:
+      bool test_compatibility(ivl_type_t that) const;
+      bool test_equivalence(ivl_type_t that) const;
+
     private:
       bool union_;
       bool packed_;
diff --git a/nettypes.cc b/nettypes.cc
index d669bd9fe..ad2fe5860 100644
--- a/nettypes.cc
+++ b/nettypes.cc
@@ -18,6 +18,7 @@
  */
 
 # include  "nettypes.h"
+# include  "netenum.h"
 # include  <iostream>
 # include  <cassert>
 
@@ -69,9 +70,22 @@ bool ivl_type_s::type_compatible(ivl_type_t that) const
       return test_compatibility(that);
 }
 
-bool ivl_type_s::test_compatibility(const ivl_type_s* /*that*/) const
+bool ivl_type_s::test_compatibility(ivl_type_t that) const
 {
-      return false;
+      return test_equivalence(that);
+}
+
+bool ivl_type_s::type_equivalent(ivl_type_t that) const
+{
+      if (this == that)
+	    return true;
+
+      return test_equivalence(that);
+}
+
+bool ivl_type_s::test_equivalence(ivl_type_t) const
+{
+	return false;
 }
 
 netarray_t::~netarray_t()
@@ -166,3 +180,35 @@ bool prefix_to_slice(const std::vector<netrange_t>&dims,
       return true;
 }
 
+bool packed_types_equivalent(ivl_type_t a, ivl_type_t b)
+{
+      if (!a->packed() || !b->packed())
+	    return false;
+
+      if (a->base_type() != b->base_type())
+	    return false;
+
+      if (a->packed_width() != b->packed_width())
+	    return false;
+
+      if (a->get_signed() != b->get_signed())
+	    return false;
+
+      // Special case, even though enums are packed they are not equivalent,
+      // they are only assignment compatible to other packed types
+      if (dynamic_cast<const netenum_t*>(b))
+	    return false;
+
+      return true;
+}
+
+bool packed_type_compatible(ivl_type_t type)
+{
+      if (type->packed())
+	    return true;
+
+      if (type->base_type() == IVL_VT_REAL)
+	    return true;
+
+      return false;
+}
diff --git a/nettypes.h b/nettypes.h
index 0c26678dc..dc95eef46 100644
--- a/nettypes.h
+++ b/nettypes.h
@@ -47,17 +47,20 @@ class ivl_type_s {
       virtual bool get_signed() const;
       virtual bool get_scalar() const;
 
-	// Return true if "that" type is compatible with this
-	// type. Compatible means the types are essentially the same.
+	// Return true if "that" type is assignment compatible with this
+	// type.
       bool type_compatible(ivl_type_t that) const;
+        // Return true if "that" type is equivalent with this type as defined by
+	// the standard
+      bool type_equivalent(ivl_type_t that) const;
 
       virtual std::ostream& debug_dump(std::ostream&) const;
 
     private:
-	// The "type_compatible" method uses this virtual method to
-	// invoke type-specific tests of compatibility. This should
-	// only be called by the type_compatible method above.
+	// The "type_compatible" and "type_equivalent" methods uses this virtual
+	// method to invoke type-specific tests of compatibility.
       virtual bool test_compatibility(ivl_type_t that) const;
+      virtual bool test_equivalence(ivl_type_t that) const;
 };
 
 /*
@@ -162,4 +165,8 @@ extern bool prefix_to_slice(const std::vector<netrange_t>&dims,
 			    const std::list<long>&prefix, long sb,
 			    long&loff, unsigned long&lwid);
 
+
+extern bool packed_types_equivalent(ivl_type_t a, ivl_type_t b);
+extern bool packed_type_compatible(ivl_type_t type);
+
 #endif /* IVL_nettypes_H */
diff --git a/netvector.cc b/netvector.cc
index f43dd839e..bc8d83d49 100644
--- a/netvector.cc
+++ b/netvector.cc
@@ -89,19 +89,10 @@ vector<netrange_t> netvector_t::slice_dimensions() const
 
 bool netvector_t::test_compatibility(ivl_type_t that) const
 {
-      const netvector_t*that_st = dynamic_cast<const netvector_t*>(that);
-      if (that_st == 0)
-	    return false;
-
-      if (type_ != that_st->type_)
-	    return false;
-      if (packed_dims_.size() != that_st->packed_dims_.size())
-	    return false;
-
-      for (size_t idx = 0 ; idx < packed_dims_.size() ; idx += 1) {
-	    if (packed_dims_[idx] != that_st->packed_dims_[idx])
-		  return false;
-      }
-
-      return true;
+      return packed_type_compatible(that);
+}
+
+bool netvector_t::test_equivalence(const ivl_type_t that) const
+{
+      return packed_types_equivalent(this, that);
 }
diff --git a/netvector.h b/netvector.h
index 55a482ec8..1bf919cec 100644
--- a/netvector.h
+++ b/netvector.h
@@ -86,6 +86,7 @@ class netvector_t : public ivl_type_s {
 
     private:
       bool test_compatibility(ivl_type_t that) const;
+      bool test_equivalence(ivl_type_t that) const;
 
     private:
       std::vector<netrange_t> packed_dims_;
diff --git a/t-dll-api.cc b/t-dll-api.cc
index c25ab938d..2b074722e 100644
--- a/t-dll-api.cc
+++ b/t-dll-api.cc
@@ -3202,6 +3202,11 @@ extern "C" ivl_type_t ivl_type_element(ivl_type_t net)
       return 0;
 }
 
+extern "C" unsigned ivl_type_packed_width(ivl_type_t net)
+{
+      return net->packed_width();
+}
+
 extern "C" unsigned ivl_type_packed_dimensions(ivl_type_t net)
 {
       assert(net);
diff --git a/tgt-vvp/eval_object.c b/tgt-vvp/eval_object.c
index c38b432bd..a825d6045 100644
--- a/tgt-vvp/eval_object.c
+++ b/tgt-vvp/eval_object.c
@@ -28,7 +28,7 @@ void darray_new(ivl_type_t element_type, unsigned size_reg)
       ivl_variable_type_t type = ivl_type_base(element_type);
 
       if ((type == IVL_VT_BOOL) || (type == IVL_VT_LOGIC)) {
-	    wid = width_of_packed_type(element_type);
+	    wid = ivl_type_packed_width(element_type);
 	    signed_char = ivl_type_signed(element_type) ? "s" : "";
       } else {
 	      // REAL or STRING objects are not packable.
@@ -133,7 +133,7 @@ static int eval_darray_new(ivl_expr_t ex)
 	    switch (ivl_type_base(element_type)) {
 		case IVL_VT_BOOL:
 		case IVL_VT_LOGIC:
-		  wid = width_of_packed_type(element_type);
+		  wid = ivl_type_packed_width(element_type);
 		  for (idx = 0 ; idx < cnt ; idx += 1) {
 			draw_eval_vec4(init_expr);
 			fprintf(vvp_out, "    %%parti/%c %u, %ld, 6;\n",
diff --git a/tgt-vvp/stmt_assign.c b/tgt-vvp/stmt_assign.c
index 3095fe1a9..1d1817d52 100644
--- a/tgt-vvp/stmt_assign.c
+++ b/tgt-vvp/stmt_assign.c
@@ -897,21 +897,6 @@ static int show_stmt_assign_sig_string(ivl_statement_t net)
       return 0;
 }
 
-unsigned width_of_packed_type(ivl_type_t net)
-{
-      unsigned idx;
-      unsigned width = 1;
-      for (idx = 0 ; idx < ivl_type_packed_dimensions(net) ; idx += 1) {
-	    int lsb = ivl_type_packed_lsb(net,idx);
-	    int msb = ivl_type_packed_msb(net,idx);
-	    if (lsb <= msb)
-		  width *= msb - lsb + 1;
-	    else
-		  width *= lsb - msb + 1;
-      }
-      return width;
-}
-
 /*
  * This function handles the special case that we assign an array
  * pattern to a dynamic array. Handle this by assigning each
@@ -934,9 +919,9 @@ static int show_stmt_assign_darray_pattern(ivl_statement_t net)
 #if 0
       unsigned element_width = 1;
       if (ivl_type_base(element_type) == IVL_VT_BOOL)
-	    element_width = width_of_packed_type(element_type);
+	    element_width = ivl_type_packed_width(element_type);
       else if (ivl_type_base(element_type) == IVL_VT_LOGIC)
-	    element_width = width_of_packed_type(element_type);
+	    element_width = ivl_type_packed_width(element_type);
 #endif
 
 // FIXME: At the moment we reallocate the array space.
@@ -1094,7 +1079,7 @@ static int show_stmt_assign_queue_pattern(ivl_signal_t var, ivl_expr_t rval,
 		  fprintf(vvp_out, "    %%ix/load 3, %u, 0;\n", idx);
 		  fprintf(vvp_out, "    %%flag_set/imm 4, 0;\n");
 		  fprintf(vvp_out, "    %%store/qdar/v v%p_0, %d, %u;\n", var, max_idx,
-		                   width_of_packed_type(element_type));
+		                   ivl_type_packed_width(element_type));
 		  break;
 
 		case IVL_VT_REAL:
@@ -1181,7 +1166,7 @@ static int show_stmt_assign_sig_queue(ivl_statement_t net)
 		 index register 3. */
 	    draw_eval_expr_into_integer(mux, 3);
 	    fprintf(vvp_out, "    %%store/qdar/v v%p_0, %d, %u;\n", var, idx,
-	                     width_of_packed_type(element_type));
+	                     ivl_type_packed_width(element_type));
 
       } else if (ivl_expr_type(rval) == IVL_EX_ARRAY_PATTERN) {
 	      /* There is no l-value mux, but the r-value is an array
@@ -1202,7 +1187,7 @@ static int show_stmt_assign_sig_queue(ivl_statement_t net)
 		  assert(ivl_type_base(element_type) == IVL_VT_BOOL ||
 		         ivl_type_base(element_type) == IVL_VT_LOGIC);
 		  fprintf(vvp_out, "    %%store/qobj/v v%p_0, %d, %u;\n",
-		                   var, idx, width_of_packed_type(element_type));
+		                   var, idx, ivl_type_packed_width(element_type));
 	    }
       }
       clr_word(idx);
diff --git a/tgt-vvp/vvp_priv.h b/tgt-vvp/vvp_priv.h
index 09746855d..aadec5512 100644
--- a/tgt-vvp/vvp_priv.h
+++ b/tgt-vvp/vvp_priv.h
@@ -80,11 +80,6 @@ extern const char* vvp_signal_label(ivl_signal_t sig);
 extern unsigned width_of_nexus(ivl_nexus_t nex);
 extern ivl_variable_type_t data_type_of_nexus(ivl_nexus_t nex);
 
-/*
- * Calculate the width (in bits) of a packed type.
- */
-extern unsigned width_of_packed_type(ivl_type_t net);
-
 extern int can_elide_bufz(ivl_net_logic_t net, ivl_nexus_ptr_t nptr);
 
 /*
diff --git a/tgt-vvp/vvp_process.c b/tgt-vvp/vvp_process.c
index 385e54fba..11dd7a596 100644
--- a/tgt-vvp/vvp_process.c
+++ b/tgt-vvp/vvp_process.c
@@ -1847,7 +1847,7 @@ static int show_insert_method(ivl_statement_t net)
 	    draw_eval_vec4(parm2);
 	    fprintf(vvp_out, "    %%qinsert/v v%p_0, %d, %u;\n",
 	            var, idx,
-	            width_of_packed_type(element_type));
+	            ivl_type_packed_width(element_type));
 	    break;
       }
       return 0;
@@ -1897,7 +1897,7 @@ static int show_push_frontback_method(ivl_statement_t net, bool is_front)
 	    draw_eval_vec4(parm1);
 	    fprintf(vvp_out, "    %%store/%s/v v%p_0, %d, %u;\n",
 	            type_code, var, idx,
-	            width_of_packed_type(element_type));
+	            ivl_type_packed_width(element_type));
 	    break;
       }
       clr_word(idx);
diff --git a/tgt-vvp/vvp_scope.c b/tgt-vvp/vvp_scope.c
index 140a2020e..58b94c9be 100644
--- a/tgt-vvp/vvp_scope.c
+++ b/tgt-vvp/vvp_scope.c
@@ -540,15 +540,21 @@ static void draw_reg_in_scope(ivl_signal_t sig)
 		    swapped ? first: last, swapped ? last : first, msb, lsb);
 
       } else if (ivl_signal_data_type(sig) == IVL_VT_DARRAY) {
+	    ivl_type_t var_type = ivl_signal_net_type(sig);
+	    ivl_type_t element_type = ivl_type_element(var_type);
+
 	    fprintf(vvp_out, "v%p_0 .var/darray \"%s\", %u;%s\n", sig,
 		    vvp_mangle_name(ivl_signal_basename(sig)),
-		    ivl_signal_width(sig),
+		    ivl_type_packed_width(element_type),
 		    ivl_signal_local(sig)? " Local signal" : "");
 
       } else if (ivl_signal_data_type(sig) == IVL_VT_QUEUE) {
+	    ivl_type_t var_type = ivl_signal_net_type(sig);
+	    ivl_type_t element_type = ivl_type_element(var_type);
+
 	    fprintf(vvp_out, "v%p_0 .var/queue \"%s\", %u;%s\n", sig,
 		    vvp_mangle_name(ivl_signal_basename(sig)),
-		    ivl_signal_width(sig),
+		    ivl_type_packed_width(element_type),
 		    ivl_signal_local(sig)? " Local signal" : "");
 
       } else if (ivl_signal_data_type(sig) == IVL_VT_STRING) {