return check.instantiatedType(e.X, syntax.UnpackListExpr(e.Index), def)

	case *syntax.ParenExpr:
		// Generic types must be instantiated before they can be used in any form.
		// Consequently, generic types cannot be parenthesized.
		return check.definedType(e.X, def)

	case *syntax.ArrayType:
		typ := new(Array)
		setDefType(def, typ)
		if e.Len != nil {
			typ.len = check.arrayLength(e.Len)
		} else {
			// [...]array

		return check.instantiatedType(ix, def)

	case *ast.ParenExpr:
		// Generic types must be instantiated before they can be used in any form.
		// Consequently, generic types cannot be parenthesized.
		return check.definedType(e.X, def)

	case *ast.ArrayType:
		if e.Len == nil {
			typ := new(Slice)
			setDefType(def, typ)
			typ.elem = check.varType(e.Elt)
			return typ
		}

	_, err = parser.ParseFile(fset, "", got, 0)
	if err != nil {
		t.Errorf("%v\norig: %q\ngot : %q", err, src, got)
	}
}

// If a declaration has multiple specifications, a parenthesized
// declaration must be printed even if Lparen is token.NoPos.
func TestParenthesizedDecl(t *testing.T) {
	// a package with multiple specs in a single declaration
	const src = "package p; var ( a float64; b int )"

	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

	switch c.state {
	case stateCSSDqStr, stateCSSDqURL:
		endAndEsc = `\"`
	case stateCSSSqStr, stateCSSSqURL:
		endAndEsc = `\'`
	case stateCSSURL:
		// Unquoted URLs end with a newline or close parenthesis.
		// The below includes the wc (whitespace character) and nl.
		endAndEsc = "\\\t\n\f\r )"
	default:
		panic(c.state.String())
	}

	k := 0
	for {
		i := k + bytes.IndexAny(s[k:], endAndEsc)

		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)
					}