code: def p_genvardecl(self, p):
          'genvardecl : GENVAR genvarlist SEMICOLON'
          p[0] = Decl(p[2], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1)f p_genvardecl(self, p):
          'genvardecl : GENVAR genvarlist SEMICOLON'
          p[0] = Decl(p[2], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1))
docs: genvardecl : GENVAR genvarlist SEMICOLON