Tests: Add t_param_type_bad3

src/V3LinkDot.cpp

@@ -3341,8 +3341,8 @@ class LinkDotResolveVisitor final : public VNVisitor {
                     nodep->replaceWith(newp);
                     VL_DO_DANGLING(pushDeletep(nodep), nodep);
                 }
-            } else if (AstConstraint* const consp = VN_CAST(foundp->nodep(), Constraint)) {
-                AstNode* const newp = new AstConstraintRef{nodep->fileline(), nullptr, consp};
+            } else if (AstConstraint* const defp = VN_CAST(foundp->nodep(), Constraint)) {
+                AstNode* const newp = new AstConstraintRef{nodep->fileline(), nullptr, defp};
                 nodep->replaceWith(newp);
                 VL_DO_DANGLING(pushDeletep(nodep), nodep);
                 ok = true;

src/V3Param.cpp

@@ -928,7 +928,7 @@ class ParamProcessor final {
 
         for (auto* stmtp = srcModpr->stmtsp(); stmtp; stmtp = stmtp->nextp()) {
             if (AstParamTypeDType* dtypep = VN_CAST(stmtp, ParamTypeDType)) {
-                if (VN_IS(dtypep->subDTypep(), VoidDType)) {
+                if (VN_IS(dtypep->skipRefp(), VoidDType)) {
                     nodep->v3error(
                         "Class parameter type without default value is never given value"
                         << " (IEEE 1800-2023 6.20.1): " << dtypep->prettyNameQ());
@@ -1217,7 +1217,7 @@ class ParamVisitor final : public VNVisitor {
     }
     void visit(AstParamTypeDType* nodep) override {
         iterateChildren(nodep);
-        if (VN_IS(nodep->subDTypep(), VoidDType)) {
+        if (VN_IS(nodep->skipRefp(), VoidDType)) {
             nodep->v3error("Parameter type without default value is never given value"
                            << " (IEEE 1800-2023 6.20.1): " << nodep->prettyNameQ());
         }

test_regress/t/t_param_type_bad3.out

@@ -0,0 +1,5 @@
+%Error: t/t_param_type_bad3.v:9:26: Expecting a data type: 'PI'
+    9 |    localparam type P_T = PI;   
+      |                          ^~
+        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
+%Error: Exiting due to

test_regress/t/t_param_type_bad3.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2024 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.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+import vltest_bootstrap
+
+test.scenarios('vlt')
+
+test.lint(
+    # Bug1575 required trace to crash
+    verilator_flags2=["--trace-vcd"],
+    fails=True,
+    expect_filename=test.golden_filename)
+
+test.passes()

test_regress/t/t_param_type_bad3.v

@@ -0,0 +1,10 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2019 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t;
+   localparam int PI = 6;
+   localparam type P_T = PI;  // Bad
+endmodule