return nil, fmt.Errorf("go language version %s is not a toolchain version", rev)
	}

	// Check that the underlying toolchain exists.
	// We always ask about linux-amd64 because that one
	// has always existed and is likely to always exist in the future.
	// This avoids different behavior validating go versions on different
	// architectures. The eventual download uses the right GOOS-GOARCH.

	n := ir.NewNameAt(src.NoXPos, s, t)
	n.Class = ir.PEXTERN
	importsym(n)
}

func importsym(name *ir.Name) {
	sym := name.Sym()
	if sym.Def != nil {
		base.Fatalf("importsym of symbol that already exists: %v", sym.Def)
	}
	sym.Def = name

//go:build unix

package bio

import (
	"runtime"
	"sync/atomic"
	"syscall"
)

// mmapLimit is the maximum number of mmaped regions to create before
// falling back to reading into a heap-allocated slice. This exists
// because some operating systems place a limit on the number of
// distinct mapped regions per process. As of this writing:
//
//	Darwin    unlimited
//	DragonFly   1000000 (vm.max_proc_mmap)
//	FreeBSD   unlimited

	Syms: make(map[string]*Sym),
}

func (pkg *Pkg) Lookup(name string) *Sym {
	s, _ := pkg.LookupOK(name)
	return s
}

// LookupOK looks up name in pkg and reports whether it previously existed.
func (pkg *Pkg) LookupOK(name string) (s *Sym, existed bool) {
	// TODO(gri) remove this check in favor of specialized lookup
	if pkg == nil {
		pkg = nopkg
	}
	if s := pkg.Syms[name]; s != nil {
		return s, true
	}

	s = &Sym{

	}

	lazyBool := func(summary string, f func() bool) script.Cond {
		return script.OnceCondition(summary, func() (bool, error) { return f(), nil })
	}

	add("abscc", script.Condition("default $CC path is absolute and exists", defaultCCIsAbsolute))
	add("asan", sysCondition("-asan", platform.ASanSupported, true))
	add("buildmode", script.PrefixCondition("go supports -buildmode=<suffix>", hasBuildmode))

		if dep.Mode != "build" {
			panic("unexpected mode " + dep.Mode)
		}
		metaFilesFile := dep.Objdir + covcmd.MetaFileForPackage(dep.Package.ImportPath)
		// Check to make sure the meta-data file fragment exists
		//  and has content (may be empty if package has no functions).
		if fi, err := os.Stat(metaFilesFile); err != nil {
			continue
		} else if fi.Size() == 0 {
			continue
		}

	swig, err := exec.LookPath("swig")
	if err != nil {
		t.Skipf("swig not in PATH: %s", err)
	}

	// Check that swig was installed with Go support by checking
	// that a go directory exists inside the swiglib directory.
	// See https://golang.org/issue/23469.
	output, err := exec.Command(swig, "-go", "-swiglib").Output()
	if err != nil {
		t.Skip("swig is missing Go support")
	}

		// isGeneric handles *Signature types.
		h.typeList(targs)
	}

	return strings.ReplaceAll(buf.String(), " ", "#")
}

// lookup returns an existing instantiation of orig with targs, if it exists.
// Otherwise, it returns nil.
func (ctxt *Context) lookup(h string, orig Type, targs []Type) Type {
	ctxt.mu.Lock()
	defer ctxt.mu.Unlock()

	for _, e := range ctxt.typeMap[h] {

//	    language.MustParse("en-AU"),
//	    language.Danish,
//	    language.Chinese,
//	})
//
// This list of supported languages is typically implied by the languages for
// which there exists translations of the user interface.
//
// User-preferred languages usually come as a comma-separated list of BCP 47
// language tags.
// The MatchString finds best matches for such strings:
//

	u.logger.Printf("Uploading %d reports", len(ready))
	for _, f := range ready {
		u.uploadReport(f)
	}
	return nil
}

// debugLogFile arranges to write a log file in the given debug directory, if
// it exists.
func debugLogFile(debugDir string) (*os.File, error) {
	fd, err := os.Stat(debugDir)
	if os.IsNotExist(err) {
		return nil, nil
	}
	if err != nil {
		return nil, err
	}
	if !fd.IsDir() {