import (
	"context"
	"fmt"
	"sync"
)

type token struct{}

// A Group is a collection of goroutines working on subtasks that are part of
// the same overall task.
//
// A zero Group is valid, has no limit on the number of active goroutines,
// and does not cancel on error.
type Group struct {
	cancel func(error)

	wg sync.WaitGroup

	sem chan token

	errOnce sync.Once
	err     error
}

		if thenStart != nil {
			start.then = thenStart
			thenEnd.then = end
		} else {
			start.then = end
		}
		if elseStart != nil {
			start.els = elseStart
			elseEnd.then = end
		} else {
			start.els = end
		}
	}
	return start, end
}

func exprToString(t ast.Expr) string {
	var buf bytes.Buffer
	printer.Fprint(&buf, token.NewFileSet(), t)
	return buf.String()
}

// license that can be found in the LICENSE file.

package test

import (
	"bytes"
	"fmt"
	"go/ast"
	"go/parser"
	"go/token"
	"internal/testenv"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"
)

// runGenTest runs a test-generator, then runs the generated test.
// Generated test can either fail in compilation or execution.
// The environment variable parameter(s) is passed to the run

type parser struct {
	err error // Last error seen
}

type formatter struct {
	err error // Last error seen
}

// parseString parses bytes as a NUL-terminated C-style string.
// If a NUL byte is not found then the whole slice is returned as a string.
func (*parser) parseString(b []byte) string {
	if i := bytes.IndexByte(b, 0); i >= 0 {
		return string(b[:i])
	}
	return string(b)
}

	// Text returns the original string representation of the token.
	Text() string
	// File reports the source file name of the token.
	File() string
	// Base reports the position base of the token.
	Base() *src.PosBase
	// SetBase sets the position base.
	SetBase(*src.PosBase)
	// Line reports the source line number of the token.
	Line() int
	// Col reports the source column number of the token.
	Col() int

	return constant.MakeFromLiteral(lit, kind2tok[kind], 0)
}

var kind2tok = [...]token.Token{
	syntax.IntLit:    token.INT,
	syntax.FloatLit:  token.FLOAT,
	syntax.ImagLit:   token.IMAG,
	syntax.RuneLit:   token.CHAR,
	syntax.StringLit: token.STRING,

	// entry(x) < entry(y) allows cases x-dom-y and x-then-y.
	// But by supposition, x does not dominate y. So we have x-then-y.
	//
	// For contradiction, assume x dominates z.
	// Then entry(x) < entry(z) < exit(z) < exit(x).
	// But we know x-then-y, so entry(x) < exit(x) < entry(y) < exit(y).
	// Combining those, entry(x) < entry(z) < exit(z) < exit(x) < entry(y) < exit(y).

			p.printf("%s", strings.TrimSpace(com.Token))
			p.newline()
		}
	}

	switch x := x.(type) {
	default:
		panic(fmt.Errorf("printer: unexpected type %T", x))

	case *CommentBlock:
		// done

	case *LParen:
		p.printf("(")
	case *RParen:
		p.printf(")")

	case *Line:
		p.tokens(x.Token)

	case *LineBlock:
		p.tokens(x.Token)
		p.printf(" ")
		p.expr(&x.LParen)

// license that can be found in the LICENSE file.

//go:build compiler_bootstrap

package main

import (
	"go/ast"
	"go/token"
)

func (f *File) walkUnexpected(x interface{}, context astContext, visit func(*File, interface{}, astContext)) {
	error_(token.NoPos, "unexpected type %T in walk", x)
	panic("unexpected type")
}

func funcTypeTypeParams(n *ast.FuncType) *ast.FieldList {
	return nil
}

		switch dep {
		case "go/build", "go/scanner":
			// cmd/compile/internal/importer introduces a dependency
			// on go/build and go/token; cmd/compile/internal/ uses
			// go/constant which uses go/token in its API. Once we
			// got rid of those dependencies, enable this check again.
			// TODO(gri) fix this
			// t.Errorf("undesired dependency on %q", dep)
		}
	}