hasError, `unexpected . after term`},
	{"wrongpipeline",
		"{{12|false}}",
		hasError, `non executable command in pipeline`},
	{"emptypipeline",
		`{{ ( ) }}`,
		hasError, `missing value for parenthesized pipeline`},
	{"multilinerawstring",
		"{{ $v := `\n` }} {{",
		hasError, `multilinerawstring:2: unclosed action`},
	{"rangeundefvar",
		"{{range $k}}{{end}}",
		hasError, `undefined variable`},

	return p.CopyPipe()
}

// ActionNode holds an action (something bounded by delimiters).
// Control actions have their own nodes; ActionNode represents simple
// ones such as field evaluations and parenthesized pipelines.
type ActionNode struct {
	NodeType
	Pos
	tr   *Tree
	Line int       // The line number in the input. Deprecated: Kept for compatibility.
	Pipe *PipeNode // The pipeline in the action.
}

	"regexp"
	"sort"
	"strconv"
	"strings"

	"golang.org/x/tools/go/ast/astutil"
)

// rule syntax:
//  sexpr [&& extra conditions] => [@block] sexpr
//
// sexpr are s-expressions (lisp-like parenthesized groupings)
// sexpr ::= [variable:](opcode sexpr*)
//         | variable
//         | <type>
//         | [auxint]
//         | {aux}
//
// aux      ::= variable | {code}
// type     ::= variable | {code}

			case token.TYPE:
				// types are handled individually
				if len(d.Specs) == 1 && !d.Lparen.IsValid() {
					// common case: single declaration w/o parentheses
					// (if a single declaration is parenthesized,
					// create a new fake declaration below, so that
					// go/doc type declarations always appear w/o
					// parentheses)
					if s, ok := d.Specs[0].(*ast.TypeSpec); ok {
						r.readType(d, s)
					}

	case *syntax.ExprStmt:
		// spec: "With the exception of specific built-in functions,
		// function and method calls and receive operations can appear
		// in statement context. Such statements may be parenthesized."
		var x operand
		kind := check.rawExpr(nil, &x, s.X, nil, false)
		var msg string
		var code Code
		switch x.mode {
		default:
			if kind == statement {
				return
			}

	case *ast.ExprStmt:
		// spec: "With the exception of specific built-in functions,
		// function and method calls and receive operations can appear
		// in statement context. Such statements may be parenthesized."
		var x operand
		kind := check.rawExpr(nil, &x, s.X, nil, false)
		var msg string
		var code Code
		switch x.mode {
		default:
			if kind == statement {
				return
			}

	// This test checks nextStdChunk's behavior directly,
	// instead of needing to test it only indirectly through Parse/Format.

	// markChunks returns format with each detected
	// 'format chunk' parenthesized.
	// For example showChunks("2006-01-02") == "(2006)-(01)-(02)".
	markChunks := func(format string) string {
		// Note that NextStdChunk and StdChunkNames
		// are not part of time's public API.

 * side, this yields nine basic types of ranges, enumerated below. (Notation: a square bracket
 * ({@code [ ]}) indicates that the range is closed on that side; a parenthesis ({@code ( )}) means
 * it is either open or unbounded. The construct {@code {x | statement}} is read "the set of all
 * <i>x</i> such that <i>statement</i>.")
 *
 * <blockquote>
 *
 * <table>

 * side, this yields nine basic types of ranges, enumerated below. (Notation: a square bracket
 * ({@code [ ]}) indicates that the range is closed on that side; a parenthesis ({@code ( )}) means
 * it is either open or unbounded. The construct {@code {x | statement}} is read "the set of all
 * <i>x</i> such that <i>statement</i>.")
 *
 * <blockquote>
 *
 * <table>

		// digits?
		for s.accept(decimalDigits + "_") {
		}
	}
	return string(s.buf)
}

// complexTokens returns the real and imaginary parts of the complex number starting here.
// The number might be parenthesized and has the format (N+Ni) where N is a floating-point
// number and there are no spaces within.
func (s *ss) complexTokens() (real, imag string) {
	// TODO: accept N and Ni independently?
	parens := s.accept("(")