case itemCharConstant, itemComplex, itemNumber:
		number, err := t.newNumber(token.pos, token.val, token.typ)
		if err != nil {
			t.error(err)
		}
		return number
	case itemLeftParen:
		return t.pipeline("parenthesized pipeline", itemRightParen)
	case itemString, itemRawString:
		s, err := strconv.Unquote(token.val)
		if err != nil {
			t.error(err)
		}
		return t.newString(token.pos, token.val, s)
	}
	t.backup()

						ast.Inspect(val, inspectFunc)
					}
				}
			}
		}
	}

	// Some decls include multiple specs, such as a variable declaration with
	// multiple variables on the same line, or a parenthesized declaration. Trim
	// the declarations to include only the specs that are actually mentioned.
	// However, if there is a constant group with iota, leave it all: later

		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}

must be <a href="#Uniqueness_of_identifiers">unique</a>.
If absent, each type stands for one item of that type.
Parameter and result
lists are always parenthesized except that if there is exactly
one unnamed result it may be written as an unparenthesized type.
</p>

<p>
The final incoming parameter in a function signature may have
a type prefixed with <code>...</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.