public final Base_stmtContext base_stmt() throws RecognitionException {
		Base_stmtContext _localctx = new Base_stmtContext(_ctx, getState());
		enterRule(_localctx, 50, RULE_base_stmt);
		try {
			setState(300);
			switch (_input.LA(1)) {
			case IDENTIFIER:
				enterOuterAlt(_localctx, 1);
				{
				setState(296); assign_stmt();
				}
				break;
			case 7:
				enterOuterAlt(_localctx, 2);
				{
				setState(297); read_stmt();
				}
				break;
			case 18:
				enterOuterAlt(_localctx, 3);
				{
				setState(298); write_stmt();
				}
				break;
			case 29:
				enterOuterAlt(_localctx, 4);
				{
				setState(299); return_stmt();
				}
				break;
			default:
				throw new NoViableAltException(this);
			}
		}
		catch (RecognitionException re) {
			_localctx.exception = re;
			_errHandler.reportError(this, re);
			_errHandler.recover(this, re);
		}
		finally {
			exitRule();
		}
		return _localctx;
	}