code: def p_assignment(self, p):
          'assignment : ASSIGN lvalue EQUALS rvalue SEMICOLON'
          p[0] = Assign(p[2], p[4], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1)f p_assignment(self, p):
          'assignment : ASSIGN lvalue EQUALS rvalue SEMICOLON'
          p[0] = Assign(p[2], p[4], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1))
docs: assignment : ASSIGN lvalue EQUALS rvalue SEMICOLON