From e952e241ae2f8b33fe60da7640c90afbf0f4307f Mon Sep 17 00:00:00 2001
From: Robert Griesemer <gri@golang.org>
Date: Mon, 27 Feb 2012 21:35:26 -0800
Subject: [PATCH] gotype: provide -comments flag

When debugging ASTs, it's useful to also
see the comments on occasion. Usage:

gotype -ast -comments file.go

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5703043
---
 src/pkg/exp/gotype/doc.go    | 2 ++
 src/pkg/exp/gotype/gotype.go | 8 ++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/pkg/exp/gotype/doc.go b/src/pkg/exp/gotype/doc.go
index 1aa0faa751a..1168086771f 100644
--- a/src/pkg/exp/gotype/doc.go
+++ b/src/pkg/exp/gotype/doc.go
@@ -34,6 +34,8 @@ The flags are:
 		Verbose mode.
 
 Debugging flags:
+	-comments
+		Parse comments (ignored if -ast not set).
 	-ast
 		Print AST (disables concurrent parsing).
 	-trace
diff --git a/src/pkg/exp/gotype/gotype.go b/src/pkg/exp/gotype/gotype.go
index a2a9361866d..30eaf22fca6 100644
--- a/src/pkg/exp/gotype/gotype.go
+++ b/src/pkg/exp/gotype/gotype.go
@@ -27,8 +27,9 @@ var (
 	allErrors = flag.Bool("e", false, "print all (including spurious) errors")
 
 	// debugging support
-	printTrace = flag.Bool("trace", false, "print parse trace")
-	printAST   = flag.Bool("ast", false, "print AST")
+	parseComments = flag.Bool("comments", false, "parse comments (ignored if -ast not set)")
+	printTrace    = flag.Bool("trace", false, "print parse trace")
+	printAST      = flag.Bool("ast", false, "print AST")
 )
 
 var exitCode = 0
@@ -73,6 +74,9 @@ func parse(fset *token.FileSet, filename string, src []byte) *ast.File {
 	if *allErrors {
 		mode |= parser.SpuriousErrors
 	}
+	if *parseComments && *printAST {
+		mode |= parser.ParseComments
+	}
 	if *printTrace {
 		mode |= parser.Trace
 	}