if err != nil {
		return TypeAndValue{}, err
	}

	info := &Info{
		Types: make(map[ast.Expr]TypeAndValue),
	}
	err = CheckExpr(fset, pkg, pos, node, info)
	return info.Types[node], err
}

// CheckExpr type checks the expression expr as if it had appeared at position
// pos of package pkg. [Type] information about the expression is recorded in

	if err != nil {
		t.Fatal(err)
	}

	checkExpr := func(pos token.Pos, str string) (Object, error) {
		expr, err := parser.ParseExprFrom(fset, "eval", str, 0)
		if err != nil {
			return nil, err
		}

		info := &Info{
			Uses:       make(map[*ast.Ident]Object),
			Selections: make(map[*ast.SelectorExpr]*Selection),
		}
		if err := CheckExpr(fset, pkg, pos, expr, info); err != nil {

// If there are no files, the result is nil.
// The position must be valid.
func (check *Checker) fileFor(pos token.Pos) *ast.File {
	assert(pos.IsValid())
	// Eval and CheckExpr tests may not have any source files.
	if len(check.files) == 0 {
		return nil
	}
	for _, file := range check.files {
		if file.FileStart <= pos && pos < file.FileEnd {
			return file
		}
	}

		elts = p.parseElementList()
	}
	p.exprLev--
	rbrace := p.expect(token.RBRACE)
	return &ast.CompositeLit{typ, lbrace, elts, rbrace}
}

// checkExpr checks that x is an expression (and not a type).
func (p *parser) checkExpr(x ast.Expr) ast.Expr {
	switch t := ast.Unparen(x).(type) {
	case *ast.BadExpr:
	case *ast.Ident:
	case *ast.BasicLit:
	case *ast.FuncLit:
	case *ast.CompositeLit:

		{"Basic", Type, 5},
		{"BasicInfo", Type, 5},
		{"BasicKind", Type, 5},
		{"Bool", Const, 5},
		{"Builtin", Type, 5},
		{"Byte", Const, 5},
		{"Chan", Type, 5},
		{"ChanDir", Type, 5},
		{"CheckExpr", Func, 13},
		{"Checker", Type, 5},
		{"Checker.Info", Field, 5},
		{"Comparable", Func, 5},
		{"Complex128", Const, 5},
		{"Complex64", Const, 5},
		{"Config", Type, 5},

pkg go/constant, func Val(Value) interface{}
pkg go/token, func IsExported(string) bool
pkg go/token, func IsIdentifier(string) bool
pkg go/token, func IsKeyword(string) bool
pkg go/types, func CheckExpr(*token.FileSet, *Package, token.Pos, ast.Expr, *Info) error
pkg log, func Writer() io.Writer
pkg log/syslog (netbsd-arm64-cgo), const LOG_ALERT = 1
pkg log/syslog (netbsd-arm64-cgo), const LOG_ALERT Priority