n   int64
		err error
	}
	type justReader struct {
		io.Reader
	}
	type justWriter struct {
		io.Writer
	}
	discard := justWriter{io.Discard} // hide ReadFrom

	var with, withOut nErr
	with.n, with.err = io.Copy(discard, NewReader(nil))
	withOut.n, withOut.err = io.Copy(discard, justReader{NewReader(nil)})
	if with != withOut {
		t.Errorf("behavior differs: with = %#v; without: %#v", with, withOut)
	}
}

pkg syscall (darwin-arm64), const TIOCUCNTL ideal-int
pkg syscall (darwin-arm64), const TOSTOP = 4194304
pkg syscall (darwin-arm64), const TOSTOP ideal-int
pkg syscall (darwin-arm64), const VDISCARD = 15
pkg syscall (darwin-arm64), const VDISCARD ideal-int
pkg syscall (darwin-arm64), const VDSUSP = 11
pkg syscall (darwin-arm64), const VDSUSP ideal-int
pkg syscall (darwin-arm64), const VEOF = 0

pkg syscall (freebsd-arm64), const TIOCUCNTL ideal-int
pkg syscall (freebsd-arm64), const TOSTOP = 4194304
pkg syscall (freebsd-arm64), const TOSTOP ideal-int
pkg syscall (freebsd-arm64), const VDISCARD = 15
pkg syscall (freebsd-arm64), const VDISCARD ideal-int
pkg syscall (freebsd-arm64), const VDSUSP = 11
pkg syscall (freebsd-arm64), const VDSUSP ideal-int
pkg syscall (freebsd-arm64), const VEOF = 0

pkg io/ioutil, func TempDir(string, string) (string, error)
pkg io/ioutil, func TempFile(string, string) (*os.File, error)
pkg io/ioutil, func WriteFile(string, []uint8, os.FileMode) error
pkg io/ioutil, var Discard io.Writer
pkg log, const Ldate ideal-int
pkg log, const Llongfile ideal-int
pkg log, const Lmicroseconds ideal-int
pkg log, const Lshortfile ideal-int
pkg log, const LstdFlags ideal-int

pkg syscall (freebsd-riscv64), const TOSTOP = 4194304 #53466
pkg syscall (freebsd-riscv64), const TOSTOP ideal-int #53466
pkg syscall (freebsd-riscv64), const VDISCARD = 15 #53466
pkg syscall (freebsd-riscv64), const VDISCARD ideal-int #53466
pkg syscall (freebsd-riscv64), const VDSUSP = 11 #53466
pkg syscall (freebsd-riscv64), const VDSUSP ideal-int #53466
pkg syscall (freebsd-riscv64), const VEOF = 0 #53466

		p.symDefRef(w, word, operands)
	}
	return p.errorCount == 0
}

// nextToken returns the next non-build-comment token from the lexer.
// It reports misplaced //go:build comments but otherwise discards them.
func (p *Parser) nextToken() lex.ScanToken {
	for {
		tok := p.lex.Next()
		if tok == lex.BuildComment {
			if p.sawCode {
				p.errorf("misplaced //go:build comment")
			}
			continue
		}

<code>-</code>, <code>*</code>, and <code>&lt;&lt;</code> are
computed modulo 2<sup><i>n</i></sup>, where <i>n</i> is the bit width of
the unsigned integer's type.
Loosely speaking, these unsigned integer operations
discard high bits upon overflow, and programs may rely on "wrap around".
</p>

<p>
For signed integers, the operations <code>+</code>,
<code>-</code>, <code>*</code>, <code>/</code>, and <code>&lt;&lt;</code> may legally

pkg syscall (darwin-386), const TIOCUCNTL = 2147775590
pkg syscall (darwin-386), const TOSTOP = 4194304
pkg syscall (darwin-386), const TOSTOP ideal-int
pkg syscall (darwin-386), const VDISCARD = 15
pkg syscall (darwin-386), const VDISCARD ideal-int
pkg syscall (darwin-386), const VDSUSP = 11
pkg syscall (darwin-386), const VDSUSP ideal-int
pkg syscall (darwin-386), const VEOF = 0
pkg syscall (darwin-386), const VEOF ideal-int

			err = ErrBufferFull
		}
	}
	return b.buf[b.r : b.r+n], err
}

// Discard skips the next n bytes, returning the number of bytes discarded.
//
// If Discard skips fewer than n bytes, it also returns an error.
// If 0 <= n <= b.Buffered(), Discard is guaranteed to succeed without
// reading from the underlying io.Reader.
func (b *Reader) Discard(n int) (discarded int, err error) {
	if n < 0 {
		return 0, ErrNegativeCount
	}

	// one or more "header files" until it finds a "normal file".
	format := FormatUSTAR | FormatPAX | FormatGNU
	for {
		// Discard the remainder of the file and any padding.
		if err := discard(tr.r, tr.curr.physicalRemaining()); err != nil {
			return nil, err
		}
		if _, err := tryReadFull(tr.r, tr.blk[:tr.pad]); err != nil {
			return nil, err
		}
		tr.pad = 0