Partial fix to avoid init error on lint-only (#2895)

src/V3EmitC.cpp

@@ -1266,7 +1266,9 @@ public:
     virtual void visit(AstNode* nodep) override {
         puts(string("\n???? // ") + nodep->prettyTypeName() + "\n");
         iterateChildren(nodep);
-        nodep->v3fatalSrc("Unknown node type reached emitter: " << nodep->prettyTypeName());
+        if (!v3Global.opt.lintOnly()) {  // An internal problem, so suppress
+            nodep->v3fatalSrc("Unknown node type reached emitter: " << nodep->prettyTypeName());
+        }
     }
 
     EmitCStmts() {

test_regress/t/t_unpacked_str_init.pl

@@ -0,0 +1,20 @@
+#!/usr/bin/env 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.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+# TODO change to compile()
+lint(
+    );
+
+# No execute, not self-checking
+
+ok(1);
+1;

test_regress/t/t_unpacked_str_init.v

@@ -0,0 +1,28 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed into the Public Domain, for any use,
+// without warranty, 2020 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+package pkg;
+   localparam string REGS [0:31]
+                     = '{"zero", "ra", "sp", "gp", "tp", "t0", "t1", "t2",
+                         "s0/fp", "s1", "a0", "a1", "a2", "a3", "a4", "a5",
+                         "fa6", "fa7", "fs2", "fs3", "fs4", "fs5", "fs6",
+                         "fs7", "fs8", "fs9", "fs10", "fs11", "ft8", "ft9",
+                         "ft10", "ft11"};
+   function string disasm32(logic [4:0] op);
+      return $sformatf("lui   %s"     , REGS[op]);
+   endfunction
+endpackage
+
+module t(/*AUTOARG*/
+   // Inputs
+   op
+   );
+   import pkg::*;
+   input [4:0] op;
+   always_comb begin
+        $display("OP: 0x%08x: %s", op, disasm32(op));
+   end
+endmodule