code review 5639057: compress/gzip: NewWriter no longer returns an error.

src/pkg/compress/flate/deflate.go

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 package flate
 
 import (
         "io"
         "math"
 )
@@ skipping 414 matching lines @@
         }
         return &dw, nil
 }
 
 // NewWriterDict is like NewWriter but initializes the new
 // Writer with a preset dictionary.  The returned Writer behaves
 // as if the dictionary had been written to it without producing
 // any compressed output.  The compressed data written to w
 // can only be decompressed by a Reader initialized with the
 // same dictionary.
-//
-// If level is in the range [-1, 9] then the error returned will be nil.
-// Otherwise the error returned will be non-nil.
 func NewWriterDict(w io.Writer, level int, dict []byte) (*Writer, error) {
         dw := &dictWriter{w, false}
         zw, err := NewWriter(dw, level)
         if err != nil {
                 return nil, err
         }
         zw.Write(dict)
         zw.Flush()
         dw.enabled = true
         return zw, err
@@ skipping 33 matching lines @@
 func (w *Writer) Flush() error {
         // For more about flushing:
         // http://www.bolet.org/~pornin/deflate-flush.html
         return w.d.syncFlush()
 }
 
 // Close flushes and closes the writer.
 func (w *Writer) Close() error {
         return w.d.close()
 }