Merge pull request #5085 from YosysHQ/krys/fix_5069

verilog_parser.y: Delete unused TOK_ID

frontends/verilog/verilog_parser.y

@@ -2249,7 +2249,8 @@ cell_parameter:
 		node->children.push_back($1);
 	} |
 	'.' TOK_ID '(' ')' {
-		// just ignore empty parameters
+		// delete unused TOK_ID
+		delete $2;
 	} |
 	'.' TOK_ID '(' expr ')' {
 		AstNode *node = new AstNode(AST_PARASET);

tests/verilog/param_default.ys

@@ -0,0 +1,24 @@
+logger -expect-no-warnings
+read_verilog << EOF
+module bar (
+	input portname
+);
+	parameter paramname = 7;
+endmodule
+ 
+module empty (
+);
+ 	bar #() barinstance ();
+endmodule
+
+module implicit (
+);
+ 	bar #(.paramname()) barinstance (.portname());
+endmodule
+
+module explicit (
+	input a
+);
+	bar #(.paramname(3)) barinstance (.portname(a));
+endmodule
+EOF