1 files changed, 0 insertions, 91 deletions
diff --git a/src/cmd/vet/buildtag.go b/src/cmd/vet/buildtag.go
deleted file mode 100644
index 0ab13cb8a..000000000
--- a/src/cmd/vet/buildtag.go
+++ /dev/null
@@ -1,91 +0,0 @@
-// Copyright 2013 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
-
-import (
-	"bytes"
-	"fmt"
-	"os"
-	"strings"
-	"unicode"
-)
-
-var (
-	nl         = []byte("\n")
-	slashSlash = []byte("//")
-	plusBuild  = []byte("+build")
-)
-
-// checkBuildTag checks that build tags are in the correct location and well-formed.
-func checkBuildTag(name string, data []byte) {
-	if !vet("buildtags") {
-		return
-	}
-	lines := bytes.SplitAfter(data, nl)
-
-	// Determine cutpoint where +build comments are no longer valid.
-	// They are valid in leading // comments in the file followed by
-	// a blank line.
-	var cutoff int
-	for i, line := range lines {
-		line = bytes.TrimSpace(line)
-		if len(line) == 0 {
-			cutoff = i
-			continue
-		}
-		if bytes.HasPrefix(line, slashSlash) {
-			continue
-		}
-		break
-	}
-
-	for i, line := range lines {
-		line = bytes.TrimSpace(line)
-		if !bytes.HasPrefix(line, slashSlash) {
-			continue
-		}
-		text := bytes.TrimSpace(line[2:])
-		if bytes.HasPrefix(text, plusBuild) {
-			fields := bytes.Fields(text)
-			if !bytes.Equal(fields[0], plusBuild) {
-				// Comment is something like +buildasdf not +build.
-				fmt.Fprintf(os.Stderr, "%s:%d: possible malformed +build comment\n", name, i+1)
-				continue
-			}
-			if i >= cutoff {
-				fmt.Fprintf(os.Stderr, "%s:%d: +build comment appears too late in file\n", name, i+1)
-				setExit(1)
-				continue
-			}
-			// Check arguments.
-		Args:
-			for _, arg := range fields[1:] {
-				for _, elem := range strings.Split(string(arg), ",") {
-					if strings.HasPrefix(elem, "!!") {
-						fmt.Fprintf(os.Stderr, "%s:%d: invalid double negative in build constraint: %s\n", name, i+1, arg)
-						setExit(1)
-						break Args
-					}
-					if strings.HasPrefix(elem, "!") {
-						elem = elem[1:]
-					}
-					for _, c := range elem {
-						if !unicode.IsLetter(c) && !unicode.IsDigit(c) && c != '_' && c != '.' {
-							fmt.Fprintf(os.Stderr, "%s:%d: invalid non-alphanumeric build constraint: %s\n", name, i+1, arg)
-							setExit(1)
-							break Args
-						}
-					}
-				}
-			}
-			continue
-		}
-		// Comment with +build but not at beginning.
-		if bytes.Contains(line, plusBuild) && i < cutoff {
-			fmt.Fprintf(os.Stderr, "%s:%d: possible malformed +build comment\n", name, i+1)
-			continue
-		}
-	}
-}