func (p *parser) pexpr(x Expr, keep_parens bool) Expr {
	if trace {
		defer p.trace("pexpr")()
	}

	if x == nil {
		x = p.operand(keep_parens)
	}

loop:
	for {
		pos := p.pos()
		switch p.tok {
		case _Dot:
			p.next()
			switch p.tok {
			case _Name:
				// pexpr '.' sym
				t := new(SelectorExpr)
				t.pos = pos

func (check *Checker) binary(x *operand, e syntax.Expr, lhs, rhs syntax.Expr, op syntax.Operator) {
	var y operand

	check.expr(nil, x, lhs)
	check.expr(nil, &y, rhs)

	if x.mode == invalid {
		return
	}
	if y.mode == invalid {
		x.mode = invalid
		x.expr = y.expr
		return
	}

	if isShift(op) {
		check.shift(x, &y, e, op)
		return
	}

func (check *Checker) binary(x *operand, e ast.Expr, lhs, rhs ast.Expr, op token.Token, opPos token.Pos) {
	var y operand

	check.expr(nil, x, lhs)
	check.expr(nil, &y, rhs)

	if x.mode == invalid {
		return
	}
	if y.mode == invalid {
		x.mode = invalid
		x.expr = y.expr
		return
	}

	if isShift(op) {
		check.shift(x, &y, e, op)
		return
	}

      "targets": [
        {
          "datasource": {
            "type": "prometheus",
            "uid": "${DS_PROMETHEUS}"
          },
          "exemplar": true,
          "expr": "time() - max(minio_node_process_starttime_seconds{job=~\"$scrape_jobs\"})",
          "format": "time_series",
          "instant": true,
          "interval": "",
          "intervalFactor": 1,

      "targets": [
        {
          "datasource": {
            "type": "prometheus",
            "uid": "${DS_PROMETHEUS}"
          },
          "exemplar": true,
          "expr": "sum by (server) (minio_node_replication_average_active_workers{job=\"$scrape_jobs\"})",
          "interval": "1m",
          "intervalFactor": 2,
          "legendFormat": "{{server}}",
          "refId": "A"

			}
		case "var":
			expr = &ast.StarExpr{Star: (*r.Expr).Pos(), X: expr}
		case "macro":
			expr = &ast.CallExpr{Fun: expr}
		}
	case ctxSelector:
		if r.Name.Kind == "var" {
			expr = &ast.StarExpr{Star: (*r.Expr).Pos(), X: expr}
		} else {
			error_(r.Pos(), "only C variables allowed in selector expression %s", fixGo(r.Name.Go))
		}
	case ctxType:

		info := Info{
			Types: make(map[ast.Expr]TypeAndValue),
		}
		name := mustTypecheck(test.src, nil, &info).Name()

		// look for expression
		var expr ast.Expr
		for e := range info.Types {
			if ExprString(e) == test.expr {
				expr = e
				break
			}
		}
		if expr == nil {
			t.Errorf("package %s: no expression found for %s", name, test.expr)
			continue
		}
		tv := info.Types[expr]

		info := Info{
			Types: make(map[syntax.Expr]TypeAndValue),
		}
		name := mustTypecheck(test.src, nil, &info).Name()

		// look for expression
		var expr syntax.Expr
		for e := range info.Types {
			if ExprString(e) == test.expr {
				expr = e
				break
			}
		}
		if expr == nil {
			t.Errorf("package %s: no expression found for %s", name, test.expr)
			continue
		}
		tv := info.Types[expr]

		st.advance(2)
		typ := st.demangleType(false)
		expr := st.expression()
		offset := 0
		if len(st.str) > 0 && (st.str[0] == 'n' || isDigit(st.str[0])) {
			offset = st.number()
		}
		if len(st.str) == 0 || st.str[0] != 'E' {
			st.fail("expected E after pointer-to-member conversion")
		}
		st.advance(1)
		return &PtrMemCast{
			Type:   typ,
			Expr:   expr,
			Offset: offset,
		}

    }?.candidate?.originScope

    /**
     * Returns whether a member of companion is used to initialize the enum entry or not. For example,
     *     enum class C(val i: Int) {
     *         ONE(<expr>C.K</expr>)  // C.ONE uses C.K for initialization
     *         ;
     *         companion object {
     *             const val K = 1
     *         }
     *     }
     */