return false
	}
	for _, b := range f.Blocks {
		for _, v := range b.Values {
			switch v.Op {
			case OpStaticCall, OpStaticLECall:
				// Check for racefuncenter will encounter racefuncexit and vice versa.
				// Allow calls to panic*
				s := v.Aux.(*AuxCall).Fn.String()
				switch s {
				case "runtime.racefuncenter", "runtime.racefuncexit",

--

[[sec:advanced_inc_build]]
== Advanced techniques

Everything you’ve seen so far in this section will cover most of the use cases you’ll encounter, but there are some scenarios that need special treatment. We’ll present a few of those next with the appropriate solutions.


[[sec:add_cached_input_output_methods]]
=== Adding your own cached input/output methods

Hence, it doesn't make sense to define a standalone copy spec without at least one `from()` defined.
====

Suppose you encounter a scenario in which you want to apply the same copy configuration to _different_ sets of files.
In that case, you can share the configuration block directly without using `copySpec()`.

	if t.chatty != nil {
		t.chatty.Updatef(t.name, "=== CONT  %s\n", t.name)
	}
	running.Store(t.name, highPrecisionTimeNow())
	t.start = highPrecisionTimeNow()

	// Reset the local race counter to ignore any races that happened while this
	// goroutine was blocked, such as in the parent test or in other parallel
	// subtests.
	//
	// (Note that we don't call parent.checkRaces here:

	special   special
	done      bool
	reachable bool
}

// specialPinCounter tracks whether an object is pinned multiple times.
type specialPinCounter struct {
	special special
	counter uintptr
}

// specialsIter helps iterate over specials lists.
type specialsIter struct {
	pprev **special
	s     *special
}

func newSpecialsIter(span *mspan) specialsIter {

			}
			if runtime.GOOS == "openbsd" && *flagLibGCC == "libgcc.a" {
				// On OpenBSD `clang --print-libgcc-file-name` returns "libgcc.a".
				// In this case we fail to load libgcc.a and can encounter link
				// errors - see if we can find libcompiler_rt.a instead.
				*flagLibGCC = ctxt.findLibPathCmd("--print-file-name=libcompiler_rt.a", "libcompiler_rt")
			}
			if ctxt.HeadType == objabi.Hwindows {

		entry, e := direntLeToDirentUnix(&entryLE, d, path)
		if e != nil {
			return n, e
		}

		reclen := int(entry.Reclen)
		if reclen > len(buf) {
			// Not enough room. Return for now.
			// The counter will let us know where we should start up again.
			// Note: this strategy for suspending in the middle and
			// restarting is O(n^2) in the length of the directory. Oh well.
			break
		}

	}
}

// The doDemangle function is the entry point into the demangler proper.
func doDemangle(name string, options ...Option) (ret AST, err error) {
	// When the demangling routines encounter an error, they panic
	// with a value of type demangleErr.
	defer func() {
		if r := recover(); r != nil {
			if de, ok := r.(demangleErr); ok {
				ret = nil
				err = de
				return
			}
			panic(r)