diff --git a/src/V3Number.cpp b/src/V3Number.cpp
index 9fa4ece56..15cd9ffc2 100644
--- a/src/V3Number.cpp
+++ b/src/V3Number.cpp
@@ -570,7 +570,7 @@ string V3Number::ascii(bool prefixed, bool cleanVerilog) const VL_MT_STABLE {
     }
     if (isNull()) {
         if (VL_UNCOVERABLE(!isEqZero())) {
-            out << "-%E-null-not-zero";
+            out << "-%E-null-not-zero";  // LCOV_EXCL_LINE
         } else {
             out << " [null]";
         }
diff --git a/test_regress/t/t_assert_basic.v b/test_regress/t/t_assert_basic.v
index 6fa5271e8..52ab6ed42 100644
--- a/test_regress/t/t_assert_basic.v
+++ b/test_regress/t/t_assert_basic.v
@@ -35,9 +35,12 @@ module t (/*AUTOARG*/
             assert (0) else $info("Info message");
             assume (0) else $info("Info message from failing assumption");
             assert (0) else $info("Info message, cyc=%d", cyc);
-            InWarningBlock: assert (0) else $warning("Warning.... 1.0=%f 2.0=%f", 1.0, 2.0);
-            InErrorBlock: assert (0) else $error("Error....");
-            assert (0) else $fatal(1,"Fatal....");
+            InWarningBlock: assert (0) else $warning;
+            InWarningMBlock: assert (0) else $warning("Warning.... 1.0=%f 2.0=%f", 1.0, 2.0);
+            InErrorBlock: assert (0) else $error;
+            InErrorMBlock: assert (0) else $error("Error....");
+            assert (0) else $fatal(1, "Fatal....");
+            assert (0) else $fatal;
 `endif
          end
          if (cyc==10) begin
diff --git a/test_regress/t/t_assert_comp_bad.out b/test_regress/t/t_assert_comp_bad.out
index 405743853..e5c696031 100644
--- a/test_regress/t/t_assert_comp_bad.out
+++ b/test_regress/t/t_assert_comp_bad.out
@@ -32,4 +32,8 @@
                                               : ... note: In instance 't'
    17 |       $fatal(0, "User elaboration-time fatal");
       |       ^~~~~~
+%Warning-USERFATAL: t/t_assert_comp_bad.v:18:7: Elaboration system task message (IEEE 1800-2023 20.11)
+                                              : ... note: In instance 't'
+   18 |       $fatal;
+      |       ^~~~~~
 %Error: Exiting due to
diff --git a/test_regress/t/t_assert_comp_bad.pl b/test_regress/t/t_assert_comp_bad.pl
index 2f4344df5..3bc6896ac 100755
--- a/test_regress/t/t_assert_comp_bad.pl
+++ b/test_regress/t/t_assert_comp_bad.pl
@@ -61,7 +61,7 @@ if (!-r "$root/.git") {
     extract(
         in => $Self->{golden_filename},
         out => "../docs/gen/ex_USERFATAL_msg.rst",
-        regexp => qr/USERFATAL/);
+        regexp => qr/USERFATAL:.* User/);
 }
 
 ok(1);
diff --git a/test_regress/t/t_assert_comp_bad.v b/test_regress/t/t_assert_comp_bad.v
index b8bcb1bb3..56a32fb8b 100644
--- a/test_regress/t/t_assert_comp_bad.v
+++ b/test_regress/t/t_assert_comp_bad.v
@@ -15,6 +15,7 @@ module t (/*AUTOARG*/);
       $error;
       $error("User elaboration-time error");
       $fatal(0, "User elaboration-time fatal");
+      $fatal;
    end
 
 endmodule