newRS, rsErr := updateRoots(ctx, rs.direct, rs, nil, nil, false)
		if rsErr != nil {
			// Failed to update roots, perhaps because of an error in a transitive
			// dependency needed for the update. Return the original Requirements
			// instead.
			return rs, mg, rsErr
		}
		rs = newRS
		mg, mgErr = rs.Graph(ctx)
	}

	return rs, mg, mgErr
}

		}

	case *Named:
		// Two named types unify if their type names originate in the same type declaration.
		// If they are instantiated, their type argument lists must unify.
		if y := asNamed(y); y != nil {
			// Check type arguments before origins so they unify
			// even if the origins don't match; for better error
			// messages (see go.dev/issue/53692).
			xargs := x.TypeArgs().list()

		ret, err = time.Parse(formatStr, s)
	}
	if err != nil {
		return
	}

	if serialized := ret.Format(formatStr); serialized != s {
		err = fmt.Errorf("asn1: time did not serialize back to the original value and may be invalid: given %q, but serialized as %q", s, serialized)
		return
	}

	if ret.Year() >= 2050 {
		// UTCTime only encodes times prior to 2050. See https://tools.ietf.org/html/rfc5280#section-4.1.2.5.1

		// to create duplicate ABI wrappers.
		//
		// However, if it's given a linkname for exporting to
		// C, then we don't make ABI wrappers because the cgo
		// tool wants the original definition.
		hasBody := len(fn.Body) != 0
		if sym.Linkname != "" && (hasBody || hasDefABI) && len(cgoExport) == 0 {
			fn.ABIRefs |= obj.ABISetCallable
		}

		// Double check that cgo-exported symbols don't get

		t.Fatal(err)
	}
	if err := os.Chdir(dir); err != nil {
		t.Fatal(err)
	}
	t.Logf("Chdir(%#q)", dir)

	t.Cleanup(func() {
		if err := os.Chdir(prev); err != nil {
			// Couldn't chdir back to the original working directory.
			// panic instead of t.Fatal so that we don't run other tests
			// in an unexpected location.
			panic("couldn't restore working directory: " + err.Error())
		}
	})
}

	// (see last comment in this function)
	sources := [...]string{
		"package p; type A interface{ A() }",
		"package p; type B interface{ B() }",
		"package p; type X interface{ A; B }",
	}

	// compute original file ASTs
	var orig [len(sources)]*syntax.File
	for i, src := range sources {
		orig[i] = mustParse(src)
	}

	// run the test for all order permutations of the incoming files

		"//line File2:20\n" +
		"@\n" + // different file, but same line
		"//line File2:1\n" +
		"@ @\n" + // same file, decreasing line number
		"//line File1:1\n" +
		"@ @ @" // original file, line 1 again

	var list ErrorList
	eh := func(pos token.Position, msg string) { list.Add(pos, msg) }

	var s Scanner
	s.Init(fset.AddFile("File1", fset.Base(), len(src)), []byte(src), eh, dontInsertSemis)

	public2, ok := publicInterface.(PublicKey)
	if !ok {
		t.Fatalf("expected PublicKey from Public() but got %T", publicInterface)
	}

	if !bytes.Equal(public, public2) {
		t.Errorf("public keys do not match: original:%x vs Public():%x", public, public2)
	}

	message := []byte("message")
	var noHash crypto.Hash
	signature, err := signer.Sign(zero, message, noHash)
	if err != nil {
		t.Fatalf("error from Sign(): %s", err)

	}

	// compute type set if necessary
	if ityp.tset == nil {
		// pos is used for tracing output; start with the type parameter position.
		pos := t.obj.pos
		// use the (original or possibly instantiated) type bound position if we have one
		if n := asNamed(bound); n != nil {
			pos = n.obj.pos
		}
		computeInterfaceTypeSet(t.check, pos, ityp)
	}

	return ityp
}

// Package constraint implements parsing and evaluation of build constraint lines.
// See https://golang.org/cmd/go/#hdr-Build_constraints for documentation about build constraints themselves.
//
// This package parses both the original “// +build” syntax and the “//go:build” syntax that was added in Go 1.17.
// See https://golang.org/design/draft-gobuild for details about the “//go:build” syntax.
package constraint

import (
	"errors"
	"strings"