gofmt: remove -trace and -ast flags

Functionality was only present for
debuggging and now is available in
gocheck where is makes more sense.

R=rsc
CC=golang-dev
https://golang.org/cl/4239078

src/cmd/gofmt/doc.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 /*
-
 Gofmt formats Go programs.
 
 Without an explicit path, it processes the standard input.  Given a file,
@@ -16,14 +15,16 @@ Usage:
 The flags are:
 
 	-l
-		just list files whose formatting differs from gofmt's; generate no other output
-		unless -w is also set.
+		just list files whose formatting differs from gofmt's;
+		generate no other output unless -w is also set.
 	-r rule
 		apply the rewrite rule to the source before reformatting.
 	-s
 		try to simplify code (after applying the rewrite rule, if any).
 	-w
 		if set, overwrite each input file with its output.
+	-comments=true
+		print comments; if false, all comments are elided from the output.
 	-spaces
 		align with spaces instead of tabs.
 	-tabindent
@@ -31,15 +32,6 @@ The flags are:
 	-tabwidth=8
 		tab width in spaces.
 
-Debugging flags:
-
-	-trace
-		print parse trace.
-	-ast
-		print AST (before rewrites).
-	-comments=true
-		print comments; if false, all comments are elided from the output.
-
 The rewrite rule specified with the -r flag must be a string of the form:
 
 	pattern -> replacement

src/cmd/gofmt/gofmt.go

@@ -27,12 +27,8 @@ var (
 	rewriteRule = flag.String("r", "", "rewrite rule (e.g., 'α[β:len(α)] -> α[β:]')")
 	simplifyAST = flag.Bool("s", false, "simplify code")
 
-	// debugging support
-	comments = flag.Bool("comments", true, "print comments")
-	trace    = flag.Bool("trace", false, "print parse trace")
-	printAST = flag.Bool("ast", false, "print AST (before rewrites)")
-
 	// layout control
+	comments  = flag.Bool("comments", true, "print comments")
 	tabWidth  = flag.Int("tabwidth", 8, "tab width")
 	tabIndent = flag.Bool("tabindent", true, "indent with tabs independent of -spaces")
 	useSpaces = flag.Bool("spaces", true, "align with spaces instead of tabs")
@@ -66,9 +62,6 @@ func initParserMode() {
 	if *comments {
 		parserMode |= parser.ParseComments
 	}
-	if *trace {
-		parserMode |= parser.Trace
-	}
 }
 
 
@@ -101,10 +94,6 @@ func processFile(f *os.File) os.Error {
 		return err
 	}
 
-	if *printAST {
-		ast.Print(file)
-	}
-
 	if rewrite != nil {
 		file = rewrite(file)
 	}