// Disable GOEXPERIMENT when building toolchain1 and
	// go_bootstrap. We don't need any experiments for the
	// bootstrap toolchain, and this lets us avoid duplicating the
	// GOEXPERIMENT-related build logic from cmd/go here. If the
	// bootstrap toolchain is < Go 1.17, it will ignore this
	// anyway since GOEXPERIMENT is baked in; otherwise it will

					t.Fatalf("failed to parse $GO_TEST_TIMEOUT_SCALE = %q as integer: %v", s, err)
				}
				tim *= timeoutScale
			}
		case "-goexperiment": // set GOEXPERIMENT environment
			args = args[1:]
			if goexp != "" {
				goexp += ","
			}
			goexp += args[0]
			runenv = append(runenv, "GOEXPERIMENT="+goexp)

		case "-godebug": // set GODEBUG environment
			args = args[1:]
			if godebug != "" {
				godebug += ","

				pkg:      "crypto/x509",
			})
	}

	// GOEXPERIMENT=rangefunc tests
	if !t.compileOnly {
		for _, pkg := range []string{"iter", "slices", "maps"} {
			t.registerTest("GOEXPERIMENT=rangefunc",
				&goTest{
					variant: pkg,
					short:   t.short,
					env:     []string{"GOEXPERIMENT=rangefunc"},
					pkg:     pkg,
				})
		}
	}

	// assist by pre-paying for this many bytes of future allocations.
	gcOverAssistWork = 64 << 10

	// defaultHeapMinimum is the value of heapMinimum for GOGC==100.
	defaultHeapMinimum = (goexperiment.HeapMinimum512KiBInt)*(512<<10) +
		(1-goexperiment.HeapMinimum512KiBInt)*(4<<20)

	// maxStackScanSlack is the bytes of stack space allocated or freed
	// that can accumulate on a P before updating gcController.stackSize.

	}
	if ctxt.GOOS == "ios" && name == "darwin" {
		return true
	}
	if name == "unix" && unixOS[ctxt.GOOS] {
		return true
	}
	if name == "boringcrypto" {
		name = "goexperiment.boringcrypto" // boringcrypto is an old name for goexperiment.boringcrypto
	}

	// other tags
	for _, tag := range ctxt.BuildTags {
		if tag == name {
			return true
		}
	}
	for _, tag := range ctxt.ToolTags {

// precondition is not followed, this function will fail to scan the
// right pointers.
//
// When in doubt, pass nil for typ. That is safe and will always work.
//
// Callers must perform cgo checks if goexperiment.CgoCheck2.
//
//go:nosplit
func bulkBarrierPreWrite(dst, src, size uintptr, typ *abi.Type) {
	if (dst|src|size)&(goarch.PtrSize-1) != 0 {
		throw("bulkBarrierPreWrite: unaligned arguments")
	}

// testing needs, where ordinary test functions suffice.
package testing

import (
	"bytes"
	"errors"
	"flag"
	"fmt"
	"internal/goexperiment"
	"internal/race"
	"io"
	"math/rand"
	"os"
	"reflect"
	"runtime"
	"runtime/debug"
	"runtime/trace"
	"slices"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"time"

	// Gather our arguments into registers.
	MOVQ	fn+0(FP), BX
	MOVQ	frame+8(FP), CX
	MOVQ	ctxt+16(FP), DX
	// Compute the size of the frame, including return PC and, if
	// GOEXPERIMENT=framepointer, the saved base pointer
	LEAQ	fn+0(FP), AX
	SUBQ	SP, AX   // AX is our actual frame size
	SUBQ	AX, DI   // Allocate the same frame size on the g stack
	MOVQ	DI, SP

	MOVQ	BX, 0(SP)