*syntax.IndexExpr,
		*syntax.SliceExpr,
		*syntax.AssertExpr,
		*syntax.ListExpr,
		//*syntax.StarExpr,
		*syntax.KeyValueExpr,
		*syntax.ArrayType,
		*syntax.StructType,
		*syntax.FuncType,
		*syntax.InterfaceType,
		*syntax.MapType,
		*syntax.ChanType:
		// These expression are never untyped - nothing to do.
		// The respective sub-expressions got their final types
		// upon assignment or use.
		if debug {

            this.left = left;
            this.right = right;
        }

        @Override
        public String with(Syntax syntax) {
            return left.with(syntax) + "." + right.with(syntax);
        }
    }

    private static class StringValue implements ExpressionValue {
        final CharSequence value;

        StringValue(CharSequence value) {

			var kind string
			switch node.(type) {
			case *syntax.File:
				kind = "file"
			case *syntax.FuncType:
				kind = "func"
			case *syntax.BlockStmt:
				kind = "block"
			case *syntax.IfStmt:
				kind = "if"
			case *syntax.SwitchStmt:
				kind = "switch"
			case *syntax.SelectStmt:
				kind = "select"
			case *syntax.CaseClause:
				kind = "case"
			case *syntax.CommClause:

		p.first = err
	}
	p.errcnt++
	if p.errh == nil {
		panic(p.first)
	}
	p.errh(err)
}

// syntaxErrorAt reports a syntax error at the given position.
func (p *parser) syntaxErrorAt(pos Pos, msg string) {
	if trace {
		p.print("syntax error: " + msg)
	}

	if p.tok == _EOF && p.first != nil {
		return // avoid meaningless follow-up errors
	}

There is one last syntax for extra properties that we should cover, one that treats `extra` as a map.
We recommend against using this in general as you lose the benefits of Kotlin's type checking and it prevents IDEs from providing as much support as they could.

   *
   * <p><b>Note:</b> this method is now unnecessary and should be treated as deprecated. Instead,
   * use the {@code HashSet} constructor directly, taking advantage of <a
   * href="http://goo.gl/iz2Wi">"diamond" syntax</a>.
   */
  public static <E extends @Nullable Object> HashSet<E> newHashSet() {
    return new HashSet<>();
  }

  /**

   *
   * <p><b>Note:</b> this method is now unnecessary and should be treated as deprecated. Instead,
   * use the {@code HashSet} constructor directly, taking advantage of <a
   * href="http://goo.gl/iz2Wi">"diamond" syntax</a>.
   */
  public static <E extends @Nullable Object> HashSet<E> newHashSet() {
    return new HashSet<>();
  }

  /**

// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package syntax

import (
	"sort"
	"strings"
	"unicode"
	"unicode/utf8"
)

// An Error describes a failure to parse a regular expression
// and gives the offending expression.
type Error struct {
	Code ErrorCode
	Expr string
}

func (e *Error) Error() string {

// provided in a variety of forms (see the various Parse* functions); the
// output is an abstract syntax tree (AST) representing the Go source. The
// parser is invoked through one of the Parse* functions.
//
// The parser accepts a larger language than is syntactically permitted by
// the Go spec, for simplicity, and for improved robustness in the presence
// of syntax errors. For instance, in method declarations, the receiver is

			if !Identical(got, want) {
				t.Errorf("%s: Recv() = %s, want %s", syntax, got, want)
			}
		} else if sig != nil && sig.Recv() != nil {
			t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
		}
	}
	// Assert that all wantOut entries were used exactly once.
	for syntax := range wantOut {
		t.Errorf("no ast.Selection found with syntax %q", syntax)
	}
}

func TestIssue8518(t *testing.T) {