ANSI Style localparam causes parsing error

[mclark-iontra]

When a localparam is encountered in the ANSI style parameter declaration, a parsing error is reported.

Example source verilog

module a_module #(
  localparam A = 2
)(
  input [A-1:0] sig
);
endmodule

---

The resulting pyverilog output:

Generating LALR tables
WARNING: 183 shift/reduce conflicts
Traceback (most recent call last):
  File ".../pyverilog_test.py", line 14, in <module>
    ast, directives = parse(vlog)
                      ^^^^^^^^^^^
  File ".../.venv/lib/python3.12/site-packages/pyverilog/vparser/parser.py", line 2338, in parse
    ast = codeparser.parse()
          ^^^^^^^^^^^^^^^^^^
  File ".../.venv/lib/python3.12/site-packages/pyverilog/vparser/parser.py", line 2316, in parse
    ast = self.parser.parse(text, debug=debug)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../.venv/lib/python3.12/site-packages/pyverilog/vparser/parser.py", line 77, in parse
    return self.parser.parse(text, lexer=self.lexer, debug=debug)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../.venv/lib/python3.12/site-packages/ply/yacc.py", line 333, in parse
    return self.parseopt_notrack(input, lexer, debug, tracking, tokenfunc)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../.venv/lib/python3.12/site-packages/ply/yacc.py", line 1201, in parseopt_notrack
    tok = call_errorfunc(self.errorfunc, errtoken, self)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../.venv/lib/python3.12/site-packages/ply/yacc.py", line 192, in call_errorfunc
    r = errorfunc(token)
        ^^^^^^^^^^^^^^^^
  File ".../.venv/lib/python3.12/site-packages/pyverilog/vparser/parser.py", line 2268, in p_error
    self._raise_error(p)
  File ".../.venv/lib/python3.12/site-packages/pyverilog/vparser/parser.py", line 2279, in _raise_error
    raise ParseError("%s: %s" % (coord, msg))
pyverilog.vparser.parser.ParseError:  line:3: before: "localparam"