tools/go/ast
Fatih Arslan bc6db94186 go/ast/astutil: do not merge if import path is last line
DeleteNamedImport assumes the import declaration is in the form of:

    import (
      "foo"
    )

If an import path is deleted there might be a blank line-sized hole:

    import (

    )

It'll merge the black hole with the last line to change it to:

    import (
    )

However the import declaration might be in the following form as well:

    import (
      "foo")

Whic means after deleting the import path, it changes to:

    import (
    )

In this case it still tries to merge the line with a non existing line,
causing token.File.MergeLine to panic.

We fix the issue by checking that the import path line is not the last
line to avoid panicing.

Fixes golang/go#20229

Change-Id: I37537a4eaa83d14db59a2926d7bb14c27167a2e4
Reviewed-on: https://go-review.googlesource.com/44372
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2017-05-29 01:35:25 +00:00
..
astutil go/ast/astutil: do not merge if import path is last line 2017-05-29 01:35:25 +00:00