func IsNaN(f float64) (is bool) {
	// IEEE 754 says that only NaNs satisfy f != f.
	// To avoid the floating-point hardware, could use:
	//	x := Float64bits(f);
	//	return uint32(x>>shift)&mask == mask && x != uvinf && x != uvneginf
	return f != f
}

// IsInf reports whether f is an infinity, according to sign.
// If sign > 0, IsInf reports whether f is positive infinity.

	S3                Metadata          `json:"s3"`
	Source            Source            `json:"source"`
	Type              madmin.TraceType  `json:"-"`
}

// Mask returns the type as mask.
func (e Event) Mask() uint64 {
	return e.EventName.Mask()
}

// Log represents event information for some event targets.
type Log struct {
	EventName Name
	Key       string
	Records   []Event

    TYPE_DISALLOWED -> TYPE_DISALLOWED

    else -> error("unexpected type: $type")
  }
}

internal infix fun Byte.and(mask: Int): Int = toInt() and mask

internal infix fun Short.and(mask: Int): Int = toInt() and mask

// The CIDR must be an IPv4 or IPv6 subnet address with a mask.
// Leading zeros in IPv4 address octets are not allowed.
// IPv4-mapped IPv6 addresses (e.g. ::ffff:1.2.3.4/24) are not allowed.
//
//	cidr(<string>) <CIDR>
//
// Examples:
//
//	cidr('192.168.0.0/16') // returns an IPv4 address with a CIDR mask
//	cidr('::1/128') // returns an IPv6 address with a CIDR mask
//	cidr('192.168.0.0/33') // error
//	cidr('::1/129') // error

        index = (index + 1) & mask;
      }
    }
    return new SmallCharMatcher(table, filter, containsZero, description);
  }

  @Override
  public boolean matches(char c) {
    if (c == 0) {
      return containsZero;
    }
    if (!checkFilter(c)) {
      return false;
    }
    int mask = table.length - 1;
    int startingIndex = smear(c) & mask;
    int index = startingIndex;

	// Load 1-15 bytes and corresponding mask.
	// Note: only the low 32-bits of R_LEN are used for the index.
	VLL R_LEN, (R_PTR), V_VAL
	VLL R_LEN, (R_MPTR), V_MASK

	// Compare each byte in input chunk against byte to be counted.
	// Each byte element will be set to either 0 (no match) or 1 (match).
	VCEQB V_CHAR, V_VAL, V_VAL // each byte will be either 0xff or 0x00
	VN    V_MASK, V_VAL, V_VAL // mask out most significant 7 bits

 * and access mask of each ACE. If the SID matches, the allow/deny flags
 * and access mask are considered. If the ACE is a "deny"
 * ACE and <i>any</i> of the desired access bits match bits in the access
 * mask of the ACE, the whole access check fails. If the ACE is an "allow"
 * ACE and <i>all</i> of the bits in the desired access bits match bits in
 * the access mask of the ACE, the access check is successful. Otherwise,

  // 'and' with an int to get a valid table index.
  private final transient int mask;

  RegularImmutableSet(Object[] elements, int hashCode, @Nullable Object[] table, int mask) {
    this.elements = elements;
    this.hashCode = hashCode;
    this.table = table;
    this.mask = mask;
  }

  @Override
  public boolean contains(@CheckForNull Object target) {

 * and access mask of each ACE. If the SID matches, the allow/deny flags
 * and access mask are considered. If the ACE is a "deny"
 * ACE and <i>any</i> of the desired access bits match bits in the access
 * mask of the ACE, the whole access check fails. If the ACE is an "allow"
 * ACE and <i>all</i> of the bits in the desired access bits match bits in
 * the access mask of the ACE, the access check is successful. Otherwise,

//go:build unix

package runtime

import "unsafe"

var NonblockingPipe = nonblockingPipe
var Fcntl = fcntl
var Closeonexec = closeonexec

func sigismember(mask *sigset, i int) bool {
	clear := *mask
	sigdelset(&clear, i)
	return clear != *mask
}

func Sigisblocked(i int) bool {
	var sigmask sigset
	sigprocmask(_SIG_SETMASK, nil, &sigmask)
	return sigismember(&sigmask, i)
}

type M = m