commit ae534bcb6ccdd13487d0491c2194d10ebcd30ff3
author Brad Fitzpatrick <bradfitz@golang.org> Mon Dec 16 14:43:29 2013 -0800
committer Brad Fitzpatrick <bradfitz@golang.org> Mon Dec 16 14:43:29 2013 -0800
tree 195d7f6447ba2c7d5fa1349080ffa2f96ea32292
parent 5eb4fdc120bc3f9d692e66f981fd857e5f9079ff

astutil: fix a comment corruption case

This fixes a case where adding an import when there are is no
existing import declaration can corrupt the position of
comments attached to types. This was the last known
goimports/astutil corruption case.

See golang.org/issue/6884 for more details.

Unfortunately this requires changing the API to add a
*token.FileSet, which we should've had before.  I will update
goimports (the only user of this API?) immediately after
submitting this.

This CL also contains a hack (used only in this case of no
imports): rather than fix the comment positions by hand
(something that only Robert might know how to do), it instead
just prints the AST, manipulates the source, and re-parses
the AST. We can fix up later.

Fixes golang/go#6884

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/38270043