if !ok {
		return nil, ErrMissingBoundary
	}
	return multipart.NewReader(r.Body, boundary), nil
}

// isH2Upgrade reports whether r represents the http2 "client preface"
// magic string.
func (r *Request) isH2Upgrade() bool {
	return r.Method == "PRI" && len(r.Header) == 0 && r.URL.Path == "*" && r.Proto == "HTTP/2.0"
}

// Return value if nonempty, def otherwise.

(Zero [3] ptr mem) =>
	(MOVBstore [2] ptr (MOVWconst [0])
		(MOVBstore [1] ptr (MOVWconst [0])
			(MOVBstore [0] ptr (MOVWconst [0]) mem)))

// Medium zeroing uses a duff device
// 4 and 128 are magic constants, see runtime/mkduff.go
(Zero [s] {t} ptr mem)
	&& s%4 == 0 && s > 4 && s <= 512
	&& t.Alignment()%4 == 0 && !config.noDuffDevice =>
	(DUFFZERO [4 * (128 - s/4)] ptr (MOVWconst [0]) mem)

	//     printf -v x "%04x" i;
	//     echo "int var_$x __attribute__((section(\"section_$x\"))) = $i;"
	//   done > y.c
	// 2. compile: gcc -c y.c -m32
	//
	// $readelf -h y.o
	// ELF Header:
	//   Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
	//   Class:                             ELF32
	//   Data:                              2's complement, little endian
	//   Version:                           1 (current)

	return int(sh.Size)
}

// The race detector can't handle ASLR (address space layout randomization).
// ASLR is on by default for NetBSD, so we turn the ASLR off explicitly
// using a magic elf Note when building race binaries.

func elfnetbsdpax(sh *ElfShdr, startva uint64, resoff uint64) int {
	n := int(Rnd(4, 4) + Rnd(4, 4))
	return elfnote(sh, startva, resoff, n)
}

	q := uintptr((uint64(n) * uint64(s.divMul)) >> 32)

	if doubleCheck && q != n/s.elemsize {
		println(n, "/", s.elemsize, "should be", n/s.elemsize, "but got", q)
		throw("bad magic division")
	}
	return q
}

// nosplit, because it is called by other nosplit code like findObject
//
//go:nosplit
func (s *mspan) objIndex(p uintptr) uintptr {

		TBSCertificate:     c,
		SignatureAlgorithm: algorithmIdentifier,
		SignatureValue:     asn1.BitString{Bytes: signature, BitLength: len(signature) * 8},
	})
}

// pemCRLPrefix is the magic string that indicates that we have a PEM encoded
// CRL.
var pemCRLPrefix = []byte("-----BEGIN X509 CRL")

// pemType is the type of a PEM encoded CRL.
var pemType = "X509 CRL"

TEXT runtime·retpolineCX(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(1)
TEXT runtime·retpolineDX(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(2)
TEXT runtime·retpolineBX(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(3)
/* SP is 4, can't happen / magic encodings */
TEXT runtime·retpolineBP(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(5)
TEXT runtime·retpolineSI(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(6)
TEXT runtime·retpolineDI(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(7)

	// It is not a standard go command flag; use os.Getenv, not cfg.Getenv.
	if os.Getenv("GO_GCFLAGS") != "" {
		fmt.Fprintf(os.Stderr, "testing: warning: no tests to run\n") // magic string for cmd/go
		fmt.Printf("cmd/go test is not compatible with $GO_GCFLAGS being set\n")
		fmt.Printf("SKIP\n")
		return
	}

	flag.Parse()

	if *proxyAddr != "" {
		StartProxy()
		select {}