1 files changed, 9 insertions, 18 deletions

diff --git a/frontends/verilog/verilog_parser.y b/frontends/verilog/verilog_parser.y
index 7849757ec..568cadd94 100644
--- a/frontends/verilog/verilog_parser.y
+++ b/frontends/verilog/verilog_parser.y
@@ -246,11 +246,10 @@ module_para_opt:
 	'#' '(' { astbuf1 = nullptr; } module_para_list { if (astbuf1) delete astbuf1; } ')' | /* empty */;
 
 module_para_list:
-	single_module_para |
-	single_module_para ',' module_para_list |
-	/* empty */;
+	single_module_para | module_para_list ',' single_module_para;
 
 single_module_para:
+	/* empty */ |
 	TOK_PARAMETER {
 		if (astbuf1) delete astbuf1;
 		astbuf1 = new AstNode(AST_PARAMETER);
@@ -801,14 +800,14 @@ single_cell:
 			astbuf2->str = *$1;
 		delete $1;
 		ast_stack.back()->children.push_back(astbuf2);
-	} '(' cell_port_list_opt ')' |
+	} '(' cell_port_list ')' |
 	TOK_ID non_opt_range {
 		astbuf2 = astbuf1->clone();
 		if (astbuf2->type != AST_PRIMITIVE)
 			astbuf2->str = *$1;
 		delete $1;
 		ast_stack.back()->children.push_back(new AstNode(AST_CELLARRAY, $2, astbuf2));
-	} '(' cell_port_list_opt ')';
+	} '(' cell_port_list ')';
 
 prim_list:
 	single_prim |
@@ -819,16 +818,16 @@ single_prim:
 	/* no name */ {
 		astbuf2 = astbuf1->clone();
 		ast_stack.back()->children.push_back(astbuf2);
-	} '(' cell_port_list_opt ')';
+	} '(' cell_port_list ')';
 
 cell_parameter_list_opt:
 	'#' '(' cell_parameter_list ')' | /* empty */;
 
 cell_parameter_list:
-	/* empty */ | cell_parameter |
-	cell_parameter ',' cell_parameter_list;
+	cell_parameter | cell_parameter_list ',' cell_parameter;
 
 cell_parameter:
+	/* empty */ |
 	expr {
 		AstNode *node = new AstNode(AST_PARASET);
 		astbuf1->children.push_back(node);
@@ -842,19 +841,11 @@ cell_parameter:
 		delete $2;
 	};
 
-cell_port_list_opt:
-	/* empty */ |
-	cell_port_list |
-	/* empty */ ',' {
-		AstNode *node = new AstNode(AST_ARGUMENT);
-		astbuf2->children.push_back(node);
-	} cell_port_list;
-
 cell_port_list:
-	cell_port |
-	cell_port_list ',' cell_port;
+	cell_port | cell_port_list ',' cell_port;
 
 cell_port:
+	/* empty */ |
 	expr {
 		AstNode *node = new AstNode(AST_ARGUMENT);
 		astbuf2->children.push_back(node);