diff --git a/elab_expr.cc b/elab_expr.cc
index c084b8029..6ee81e04f 100644
--- a/elab_expr.cc
+++ b/elab_expr.cc
@@ -3363,9 +3363,12 @@ unsigned PECastSize::test_width(Design*des, NetScope*scope, width_mode_t&)
       ivl_assert(*this, size_);
       ivl_assert(*this, base_);
 
+      expr_width_ = 0;
+
       NetExpr*size_ex = elab_and_eval(des, scope, size_, -1, true);
       NetEConst*size_ce = dynamic_cast<NetEConst*>(size_ex);
-      expr_width_ = size_ce ? size_ce->value().as_ulong() : 0;
+      if (size_ce && !size_ce->value().is_negative())
+	    expr_width_ = size_ce->value().as_ulong();
       delete size_ex;
       if (expr_width_ == 0) {
 	    cerr << get_fileline() << ": error: Cast size expression "
diff --git a/elab_type.cc b/elab_type.cc
index 2e5fbdf74..b611f655b 100644
--- a/elab_type.cc
+++ b/elab_type.cc
@@ -242,6 +242,13 @@ ivl_type_t struct_type_t::elaborate_type_raw(Design*des, NetScope*scope) const
 		       ; cur_name != curp->names->end() ;  ++ cur_name) {
 		  decl_assignment_t*namep = *cur_name;
 
+		  if (packed_flag && namep->expr) {
+			cerr << namep->expr->get_fileline() << " error: "
+			     << "Packed structs must not have default member values."
+			     << endl;
+			des->errors++;
+		  }
+
 		  netstruct_t::member_t memb;
 		  memb.name = namep->name;
 		  memb.net_type = elaborate_array_type(des, scope, *this,
diff --git a/ivlpp/lexor.lex b/ivlpp/lexor.lex
index bc34a1fac..c4987af7a 100644
--- a/ivlpp/lexor.lex
+++ b/ivlpp/lexor.lex
@@ -1130,12 +1130,14 @@ void free_macros(void)
  * variables. When the define is over, the def_finish() function
  * executes the define and clears this text. The define_continue_flag
  * is set if do_define detects that the definition is to be continued
- * on the next line.
+ * on the next line. The define_comment_flag is set when a multi-line comment is
+ * active in a define.
  */
 static char*  define_text = 0;
 static size_t define_cnt = 0;
 
 static int define_continue_flag = 0;
+static int define_comment_flag = 0;
 
 /*
  * The do_magic function puts the expansions of magic macros into
@@ -1189,6 +1191,33 @@ static char *find_arg(char*ptr, char*head, char*arg)
     return cp;
 }
 
+/*
+ * Returns 1 if the comment continues on the next line
+ */
+static int do_define_multiline_comment(char *replace_start,
+				       const char *search_start)
+{
+    char *tail = strstr(search_start, "*/");
+
+    if (!tail) {
+        if (search_start[strlen(search_start) - 1] == '\\') {
+            define_continue_flag = 1;
+            define_comment_flag = 1;
+            *replace_start++ = '\\';
+        } else {
+            define_comment_flag = 0;
+            fprintf(stderr, "%s:%u: Unterminated comment in define\n",
+                    istack->path, istack->lineno+1);
+        }
+        *replace_start = '\0';
+        return 1;
+    }
+    define_comment_flag = 0;
+    tail += 2;
+    memmove(replace_start, tail, strlen(tail) + 1);
+    return 0;
+}
+
 /*
  * Collect the definition. Normally, this returns 0. If there is a
  * continuation, then return 1 and this function may be called again
@@ -1204,6 +1233,12 @@ static void do_define(void)
 
     define_continue_flag = 0;
 
+    /* Are we in an multi-line comment? Look for the end */
+    if (define_comment_flag) {
+        if (do_define_multiline_comment(yytext, yytext))
+            return;
+    }
+
     /* Look for comments in the definition, and remove them. */
     cp = strchr(yytext, '/');
 
@@ -1215,24 +1250,14 @@ static void do_define(void)
             }
             *cp = 0;
             break;
-        }
-
-        if (cp[1] == '*') {
-            tail = strstr(cp+2, "*/");
-
-            if (tail == 0) {
-                *cp = 0;
-                fprintf(stderr, "%s:%u: Unterminated comment in define\n",
-		        istack->path, istack->lineno+1
-                );
+        } else if (cp[1] == '*') {
+            if (do_define_multiline_comment(cp, cp + 2))
                 break;
-            }
+        } else {
+	    cp++;
+	}
 
-            memmove(cp, tail+2, strlen(tail+2)+1);
-            continue;
-        }
-
-        cp = strchr(cp+1, '/');
+        cp = strchr(cp, '/');
     }
 
     /* Trim trailing white space. */
diff --git a/ivtest/ivltests/always_comb_void_func.v b/ivtest/ivltests/always_comb_void_func.v
new file mode 100644
index 000000000..0272393b9
--- /dev/null
+++ b/ivtest/ivltests/always_comb_void_func.v
@@ -0,0 +1,51 @@
+// Check that variables referenced in a void function contribute to the
+// sensitivity list of a always_comb block.
+
+module top;
+  logic passed;
+  logic [7:0] value;
+  integer counter;
+
+  function automatic void count(bit what);
+    counter = 0;
+    for (integer i = 0; i < $bits(value); i++) begin
+      if (value[i] == what)
+        counter += 1;
+    end
+  endfunction
+
+  always_comb begin
+    count(1'b1);
+  end
+
+  initial begin
+    passed = 1'b1;
+
+    value = 8'b0000_0000;
+    #1;
+    if (counter !== 0) begin
+      $display("Expected 0, got %d", counter);
+      passed = 1'b0;
+    end
+
+    value = 8'b0011_1100;
+    #1;
+    if (counter !== 4) begin
+      $display("Expected 4, got %d", counter);
+      passed = 1'b0;
+    end
+
+    value = 8'b1011_1101;
+    #1;
+    if (counter !== 6) begin
+      $display("Expected 6, got %d", counter);
+      passed = 1'b0;
+    end
+
+    if (passed) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+endmodule
diff --git a/ivtest/ivltests/macro_comment1.v b/ivtest/ivltests/macro_comment1.v
new file mode 100644
index 000000000..c1004fb61
--- /dev/null
+++ b/ivtest/ivltests/macro_comment1.v
@@ -0,0 +1,16 @@
+// Check that a '*' or '/' following a C-style comment is supported in a macro
+
+`define x(a, b) a /* comment */ * b
+`define y(a, b) a /* comment */ / b
+
+ module test;
+
+  initial begin
+    if (`x(2, 3) === 6 && `y(8, 2) === 4) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+ endmodule
diff --git a/ivtest/ivltests/macro_comment2.v b/ivtest/ivltests/macro_comment2.v
new file mode 100644
index 000000000..3908da21b
--- /dev/null
+++ b/ivtest/ivltests/macro_comment2.v
@@ -0,0 +1,17 @@
+// Check that another comment directly following a C-style comment is
+// supported in a macro.
+
+`define x(a, b) a /* comment */// * b
+`define y(a, b) a /* comment *//*/ b*/
+
+ module test;
+
+  initial begin
+    if (`x(2, 3) === 2 && `y(8, 2) === 8) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+ endmodule
diff --git a/ivtest/ivltests/macro_comment3.v b/ivtest/ivltests/macro_comment3.v
new file mode 100644
index 000000000..422d0d97f
--- /dev/null
+++ b/ivtest/ivltests/macro_comment3.v
@@ -0,0 +1,16 @@
+// Check that a '/' directly after opening a C-style comment gets handled
+// correctly in a macro.
+
+`define x(a, b) a /*/ b */ + b
+
+ module test;
+
+  initial begin
+    if (`x(2, 3) === 5) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+ endmodule
diff --git a/ivtest/ivltests/macro_comment_multiline.v b/ivtest/ivltests/macro_comment_multiline.v
new file mode 100644
index 000000000..3a7c4b18a
--- /dev/null
+++ b/ivtest/ivltests/macro_comment_multiline.v
@@ -0,0 +1,23 @@
+// Check that multi-line comments in macros are supported. Including some corner
+// cases like another comment start in the comment.
+
+`define test(a, b, c) \
+  (a + /* these is some \
+   multi line */ b /* comment \
+   that goes on \
+   and on */ ) /* and some more \
+\
+   // and even has a comments \
+   /* in the comment */ * c
+
+module test;
+
+  initial begin
+    if (`test(1, 2, 3) === 9) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+endmodule
diff --git a/ivtest/ivltests/size_cast_fail1.v b/ivtest/ivltests/size_cast_fail1.v
new file mode 100644
index 000000000..dbd520355
--- /dev/null
+++ b/ivtest/ivltests/size_cast_fail1.v
@@ -0,0 +1,12 @@
+// Check that an error is reported when using a zero value for a size cast.
+
+module test;
+
+  localparam integer N = 0;
+
+  initial begin
+    int x, y;
+    y = N'(x); // This should fail, N is zero
+  end
+
+endmodule
diff --git a/ivtest/ivltests/size_cast_fail2.v b/ivtest/ivltests/size_cast_fail2.v
new file mode 100644
index 000000000..c7a23ad87
--- /dev/null
+++ b/ivtest/ivltests/size_cast_fail2.v
@@ -0,0 +1,12 @@
+// Check that an error is reported when using a negative value for a size cast.
+
+module test;
+
+  localparam integer N = -1;
+
+  initial begin
+    int x, y;
+    y = N'(x); // This should fail, N is negative
+  end
+
+endmodule
diff --git a/ivtest/ivltests/size_cast_fail3.v b/ivtest/ivltests/size_cast_fail3.v
new file mode 100644
index 000000000..986c05281
--- /dev/null
+++ b/ivtest/ivltests/size_cast_fail3.v
@@ -0,0 +1,12 @@
+// Check that an error is reported when using an undefined value for a size cast.
+
+module test;
+
+  localparam integer N = 32'hx;
+
+  initial begin
+    int x, y;
+    y = N'(x); // This should fail, N is undefined
+  end
+
+endmodule
diff --git a/ivtest/ivltests/struct_packed_member_def.v b/ivtest/ivltests/struct_packed_member_def.v
new file mode 100644
index 000000000..1e9b58129
--- /dev/null
+++ b/ivtest/ivltests/struct_packed_member_def.v
@@ -0,0 +1,13 @@
+// Check that an error is reported when specifing a default member value for a
+// packed struct.
+
+module test;
+  struct packed {
+    // This should fail, default member value is not allowed for packed struct
+    integer x = 10;
+  } s;
+
+  initial begin
+    $display("FAILED");
+  end
+endmodule
diff --git a/ivtest/regress-sv.list b/ivtest/regress-sv.list
index be291eb87..2e5fcc75e 100644
--- a/ivtest/regress-sv.list
+++ b/ivtest/regress-sv.list
@@ -76,6 +76,7 @@ always_comb_fail4	CE,-g2005-sv		ivltests
 always_comb_no_sens	nornal,-g2005-sv	ivltests gold=always_comb_no_sens.gold
 always_comb_rfunc	nornal,-g2005-sv	ivltests
 always_comb_trig	normal,-g2005-sv	ivltests
+always_comb_void_func	normal,-g2005-sv	ivltests
 always_comb_warn	normal,-g2005-sv	ivltests gold=always_comb_warn.gold
 always_ff		normal,-g2005-sv	ivltests
 always_ff_fail		CE,-g2005-sv		ivltests
@@ -465,6 +466,9 @@ size_cast2		normal,-g2005-sv	ivltests
 size_cast3		normal,-g2009		ivltests
 size_cast4		normal,-g2009		ivltests
 size_cast5		normal,-g2009		ivltests
+size_cast_fail1		CE,-g2009		ivltests
+size_cast_fail2		CE,-g2009		ivltests
+size_cast_fail3		CE,-g2009		ivltests
 slongint_test		normal,-g2005-sv	ivltests
 sshortint_test		normal,-g2005-sv	ivltests
 string_events		normal,-g2009		ivltests gold=string_events.gold
@@ -485,6 +489,7 @@ struct_member_signed	normal,-g2009		ivltests
 struct_packed_array	normal,-g2009		ivltests
 struct_packed_array2	normal,-g2009		ivltests
 struct_packed_darray_fail CE,-g2009		ivltests
+struct_packed_member_def	CE,-g2009	ivltests
 struct_packed_queue_fail CE,-g2009		ivltests
 struct_packed_sysfunct	normal,-g2009		ivltests
 struct_packed_sysfunct2	normal,-g2009		ivltests
diff --git a/ivtest/regress-vlg.list b/ivtest/regress-vlg.list
index ef165b190..977970c83 100644
--- a/ivtest/regress-vlg.list
+++ b/ivtest/regress-vlg.list
@@ -635,6 +635,10 @@ localparam_type		normal			ivltests gold=parameter_type.gold
 long_div		normal			ivltests gold=long_div.gold
 macro2			normal			ivltests
 macro_args		CO,-yivltests			ivltests
+macro_comment1		normal			ivltests
+macro_comment2		normal			ivltests
+macro_comment3		normal			ivltests
+macro_comment_multiline	normal			ivltests
 macro_redefinition	normal,-Wmacro-redefinition	ivltests gold=macro_redefinition.gold
 macro_replacement	normal,-Wmacro-replacement	ivltests gold=macro_replacement.gold
 macsub			normal			ivltests
diff --git a/ivtest/regress-vlog95.list b/ivtest/regress-vlog95.list
index aaf99d53f..6475f29af 100644
--- a/ivtest/regress-vlog95.list
+++ b/ivtest/regress-vlog95.list
@@ -69,6 +69,7 @@
 
 # Verilog 95 does not support automatic tasks or functions.
 always_comb_rfunc	CE			ivltests
+always_comb_void_func	CE			ivltests
 automatic_error11	CE			ivltests
 automatic_error12	CE			ivltests
 automatic_error13	CE			ivltests
diff --git a/net_nex_input.cc b/net_nex_input.cc
index 7d68229ef..8c45056c8 100644
--- a/net_nex_input.cc
+++ b/net_nex_input.cc
@@ -255,6 +255,30 @@ NexusSet* NetETernary::nex_input(bool rem_out, bool always_sens, bool nested_fun
       return result;
 }
 
+// Get the contribution of a function call in a always_comb block
+static void func_always_sens(NetFuncDef *func, NexusSet *result,
+			     bool rem_out, bool nested_func)
+{
+	  // Avoid recursive function calls.
+	static set<NetFuncDef*> func_set;
+	if (!nested_func)
+	      func_set.clear();
+
+	if (!func_set.insert(func).second)
+	      return;
+
+	std::unique_ptr<NexusSet> tmp(func->proc()->nex_input(rem_out, true, true));
+	  // Remove the function inputs
+	std::unique_ptr<NexusSet> in(new NexusSet);
+	for (unsigned idx = 0; idx < func->port_count(); idx++) {
+	      NetNet *net = func->port(idx);
+	      assert(net->pin_count() == 1);
+	      in->add(net->pin(0).nexus(), 0, net->vector_width());
+	}
+	tmp->rem(*in);
+	result->add(*tmp);
+}
+
 NexusSet* NetEUFunc::nex_input(bool rem_out, bool always_sens, bool nested_func) const
 {
       NexusSet*result = new NexusSet;
@@ -265,31 +289,8 @@ NexusSet* NetEUFunc::nex_input(bool rem_out, bool always_sens, bool nested_func)
 	    delete tmp;
       }
 
-      if (always_sens) {
-	    NetFuncDef*func = func_->func_def();
-
-	      // Avoid recursive function calls.
-	    static set<NetFuncDef*> func_set;
-	    if (!nested_func)
-		  func_set.clear();
-
-	    if (!func_set.insert(func).second)
-		  return result;
-
-	    NexusSet*tmp = func->proc()->nex_input(rem_out, always_sens, true);
-	      // Remove the function inputs
-	    NexusSet*in = new NexusSet;
-	    for (unsigned idx = 0 ;  idx < func->port_count() ;  idx += 1) {
-		  NetNet*net = func->port(idx);
-		  assert(net->pin_count() == 1);
-		  in->add(net->pin(0).nexus(), 0, net->vector_width());
-	    }
-	    tmp->rem(*in);
-	    delete in;
-
-	    result->add(*tmp);
-	    delete tmp;
-      }
+      if (always_sens)
+	    func_always_sens(func_->func_def(), result, rem_out, nested_func);
 
       return result;
 }
@@ -613,9 +614,18 @@ NexusSet* NetSTask::nex_input(bool rem_out, bool always_sens, bool nested_func)
  * parameters to consider, because the compiler already removed them
  * and converted them to blocking assignments.
  */
-NexusSet* NetUTask::nex_input(bool, bool, bool) const
+NexusSet* NetUTask::nex_input(bool rem_out, bool always_sens, bool nested_func) const
 {
-      return new NexusSet;
+      NexusSet *result = new NexusSet;
+
+      /*
+       * Let the contents of void functions contribute to the sensitivity list
+       * of always_comb blocks
+       */
+      if (always_sens && task_->type() == NetScope::FUNC)
+	    func_always_sens(task_->func_def(), result, rem_out, nested_func);
+
+      return result;
 }
 
 NexusSet* NetWhile::nex_input(bool rem_out, bool always_sens, bool nested_func) const