fix: add fix for bufio, gzip, zlib NewWriterXxx changes.weekly.2012-02-14

Fixes #2979.

R=rsc, r
CC=golang-dev
https://golang.org/cl/5664046

1 files changed, 83 insertions, 0 deletions

diff --git a/src/cmd/fix/newwriter_test.go b/src/cmd/fix/newwriter_test.go
new file mode 100644
index 0000000000..1f59628a0d
--- /dev/null
+++ b/src/cmd/fix/newwriter_test.go
@@ -0,0 +1,83 @@
+// Copyright 2012 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 main
+
+func init() {
+	addTestCases(newWriterTests, newWriter)
+}
+
+var newWriterTests = []testCase{
+	{
+		Name: "newWriter.0",
+		In: `package main
+
+import (
+	"bufio"
+	"compress/gzip"
+	"compress/zlib"
+	"io"
+
+	"foo"
+)
+
+func f() *gzip.Compressor {
+	var (
+		_ gzip.Compressor
+		_ *gzip.Decompressor
+		_ struct {
+			W *gzip.Compressor
+			R gzip.Decompressor
+		}
+	)
+
+	var w io.Writer
+	br := bufio.NewReader(nil)
+	br, _ = bufio.NewReaderSize(nil, 256)
+	bw, err := bufio.NewWriterSize(w, 256) // Unfixable, as it declares an err variable.
+	bw, _ = bufio.NewWriterSize(w, 256)
+	fw, _ := foo.NewWriter(w)
+	gw, _ := gzip.NewWriter(w)
+	gw, _ = gzip.NewWriter(w)
+	zw, _ := zlib.NewWriter(w)
+	_ = zlib.NewWriterDict(zw, 0, nil)
+	return gw
+}
+`,
+		Out: `package main
+
+import (
+	"bufio"
+	"compress/gzip"
+	"compress/zlib"
+	"io"
+
+	"foo"
+)
+
+func f() *gzip.Writer {
+	var (
+		_ gzip.Writer
+		_ *gzip.Reader
+		_ struct {
+			W *gzip.Writer
+			R gzip.Reader
+		}
+	)
+
+	var w io.Writer
+	br := bufio.NewReader(nil)
+	br = bufio.NewReaderSize(nil, 256)
+	bw, err := bufio.NewWriterSize(w, 256) // Unfixable, as it declares an err variable.
+	bw = bufio.NewWriterSize(w, 256)
+	fw, _ := foo.NewWriter(w)
+	gw := gzip.NewWriter(w)
+	gw = gzip.NewWriter(w)
+	zw := zlib.NewWriter(w)
+	_ = zlib.NewWriterLevelDict(zw, 0, nil)
+	return gw
+}
+`,
+	},
+}