| "HEAD"                   ; Section 9.4
	                    | "POST"                   ; Section 9.5
	                    | "PUT"                    ; Section 9.6
	                    | "DELETE"                 ; Section 9.7
	                    | "TRACE"                  ; Section 9.8
	                    | "CONNECT"                ; Section 9.9
	                    | extension-method
	   extension-method = token

			return
		}

		if check.recordTypes() {
			check.recordBuiltinType(call.Fun, makeSig(Typ[Int], x.typ, y.typ))
		}
		x.mode = value
		x.typ = Typ[Int]

	case _Delete:
		// delete(map_, key)
		// map_ must be a map type or a type parameter describing map types.
		// The key cannot be a type parameter for now.
		map_ := x.typ
		var key Type
		if !underIs(map_, func(u Type) bool {

// windows-amd64-2012 builder (https://go.dev/issue/50051), and can only occur
// legitimately if the test leaves behind a temp file that either is still open
// or the test otherwise lacks permission to delete. In the case of legitimate
// failures, a failing test may take a bit longer to fail, but once the test is
// fixed the extra latency will go away.
func removeAll(path string) error {

				}
				v.resetArgs()
				f.freeValue(v)
			} else {
				if opcodeTable[v.Op].nilCheck {
					if v.Uses != 0 {
						base.Fatalf("nilcheck still has %d uses", v.Uses)
					}
					// We can't delete the nil check, but we mark
					// it as having void type so regalloc won't
					// try to allocate a register for it.
					v.Type = types.TypeVoid
				}
				b.Values[i] = v
				i++
			}
		}

		s.listenerGroup.Add(1)
	} else {
		delete(s.listeners, ln)
		s.listenerGroup.Done()
	}
	return true
}

func (s *Server) trackConn(c *conn, add bool) {
	s.mu.Lock()
	defer s.mu.Unlock()
	if s.activeConn == nil {
		s.activeConn = make(map[*conn]struct{})
	}
	if add {
		s.activeConn[c] = struct{}{}
	} else {
		delete(s.activeConn, c)
	}
}

		vv, ok := p.conns[key]
		if !ok {
			continue
		}
		newList := http2filterOutClientConn(vv, cc)
		if len(newList) > 0 {
			p.conns[key] = newList
		} else {
			delete(p.conns, key)
		}
	}
	delete(p.keys, cc)
}

func (p *http2clientConnPool) closeIdleConnections() {
	p.mu.Lock()
	defer p.mu.Unlock()
	// TODO: don't close a cc if it was just added to the pool

	// Remove predeclared identifiers from unresolved list.
	for n := range unresolved {
		if predeclaredTypes[n] || predeclaredConstants[n] || predeclaredFuncs[n] {
			delete(unresolved, n)
		}
	}

	// Use unresolved identifiers to determine the imports used by this
	// example. The heuristic assumes package names match base import

		m.UnsafeVals = make(map[ssa.ID]bool)
		m.UnsafeBlocks = make(map[ssa.ID]bool)
	} else {
		for k := range m.Vals {
			delete(m.Vals, k)
		}
		for k := range m.UnsafeVals {
			delete(m.UnsafeVals, k)
		}
		for k := range m.UnsafeBlocks {
			delete(m.UnsafeBlocks, k)
		}
	}
	m.DeferReturn = objw.StackMapDontCare
}

func (m *Map) set(v *ssa.Value, i objw.StackMapIndex) {

			paxHdrs[paxGNUSparseMinor] = "0"
			paxHdrs[paxGNUSparseName] = realName
			paxHdrs[paxGNUSparseRealSize] = strconv.FormatInt(realSize, 10)
			paxHdrs[paxSize] = strconv.FormatInt(hdr.Size, 10)
			delete(paxHdrs, paxPath) // Recorded by paxGNUSparseName
		}
	*/
	_ = realSize

	// Write PAX records to the output.
	isGlobal := hdr.Typeflag == TypeXGlobalHeader
	if len(paxHdrs) > 0 || isGlobal {

		if from == "" {
			return fmt.Errorf("empty string key in overlay file Replace map")
		}
		cfrom := canonicalize(from)
		if to != "" {
			// Don't canonicalize "", meaning to delete a file, because then it will turn into ".".
			to = canonicalize(to)
		}
		if otherFrom, seen := reverseCanonicalized[cfrom]; seen {
			return fmt.Errorf(