diff --git a/docs/internals.adoc b/docs/internals.adoc
index d225f500f..e460c4778 100644
--- a/docs/internals.adoc
+++ b/docs/internals.adoc
@@ -916,6 +916,10 @@ what made a <e####> line in the tree dumps):
 
    watch AstNode::s_editCntGbl==####
 
+Then, when the watch fires, to break at every following change to that node:
+
+   watch m_editCount
+
 To print a node:
 
    pn nodep
diff --git a/test_regress/driver.pl b/test_regress/driver.pl
index dcc44f5cc..1ef5bb5cb 100755
--- a/test_regress/driver.pl
+++ b/test_regress/driver.pl
@@ -366,7 +366,8 @@ sub wait_and_report {
     # Wait for all children to finish
     while ($::Fork->is_any_left) {
         $::Fork->poll;
-        if (time() - ($self->{_last_summary_time} || 0) >= 30) {
+        if ((time() - ($self->{_last_summary_time} || 0) >= 30)
+            && (!$opt_gdb && !$opt_gdbsim)) {  # Don't show for interactive gdb etc
             $self->print_summary(force=>1, show_running=>1);
         }
         Time::HiRes::usleep 100*1000;
@@ -407,7 +408,7 @@ sub print_summary {
                   @_);
     if (!$self->{quiet} || $params{force}
         || ($self->{left_cnt} < 5)
-        || time() - ($self->{_last_summary_time} || 0) >= 15) {
+        || (time() - ($self->{_last_summary_time} || 0) >= 15)) {  # Don't show for interactive gdb etc
         $self->{_last_summary_time} = time();
         print STDERR ("==SUMMARY: ".$self->sprint_summary."\n");
         if ($params{show_running}) {
diff --git a/test_regress/t/t_interface_param_acc_bits.out b/test_regress/t/t_interface_param_acc_bits.out
new file mode 100644
index 000000000..a12c72cb8
--- /dev/null
+++ b/test_regress/t/t_interface_param_acc_bits.out
@@ -0,0 +1,5 @@
+%Error: t/t_interface_param_acc_bits.v:14: Parameter-resolved constants must not use dotted references: 'dummy'
+                                         : ... In instance t
+   simple_bus #(.PARAMETER($bits(sb_intf.dummy))) simple();
+                                         ^~~~~
+%Error: Exiting due to
diff --git a/test_regress/t/t_interface_param_acc_bits.pl b/test_regress/t/t_interface_param_acc_bits.pl
new file mode 100755
index 000000000..0ce3002b1
--- /dev/null
+++ b/test_regress/t/t_interface_param_acc_bits.pl
@@ -0,0 +1,18 @@
+#!/usr/bin/perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you can
+# redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+
+scenarios(simulator => 1);
+
+compile(
+    fails => ($Self->{vlt} || $Self->{vltmt}),  # Unsupported bug1523
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_interface_param_acc_bits.v b/test_regress/t/t_interface_param_acc_bits.v
new file mode 100644
index 000000000..6859b90be
--- /dev/null
+++ b/test_regress/t/t_interface_param_acc_bits.v
@@ -0,0 +1,20 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed into the Public Domain, for any use,
+// without warranty, 2017 by Johan Bjork.
+
+// bug1593
+
+interface simple_bus #(PARAMETER = 0);
+   parameter [6:0] dummy = 22;
+endinterface
+
+module t ();
+   simple_bus sb_intf();
+   simple_bus #(.PARAMETER($bits(sb_intf.dummy))) simple();
+   initial begin
+      if (simple.PARAMETER != 7) $stop;
+      $write("*-* All Finished *-*\n");
+      $finish;
+   end
+endmodule
diff --git a/test_regress/t/t_interface_parameter_access.v b/test_regress/t/t_interface_parameter_access.v
index 918a63640..40f363153 100644
--- a/test_regress/t/t_interface_parameter_access.v
+++ b/test_regress/t/t_interface_parameter_access.v
@@ -41,12 +41,17 @@ module t (/*AUTOARG*/
                       );
 
    localparam THE_TOP_FOO = the_interface.FOO;
+   localparam THE_TOP_FOO_BITS = $bits({the_interface.FOO, the_interface.FOO});
 
    initial begin
       if (THE_TOP_FOO != 5) begin
          $display("%%Error: THE_TOP_FOO = %0d", THE_TOP_FOO);
 	 $stop;
       end
+      if (THE_TOP_FOO_BITS != 64) begin
+         $display("%%Error: THE_TOP_FOO_BITS = %0d", THE_TOP_FOO_BITS);
+	 $stop;
+      end
    end
 
 endmodule