patch: fixit for characters with invalid source encoding

[Eli Friedman]

On Tue, Aug 20, 2013 at 8:08 PM, Nick Lewycky <nlewycky at google.com> wrote:

> The attached patch adds a fixit for invalid characters to replace them
> with the equivalent \xNN code. Please review!
>

You might want to put a warning on top of the test that this file isn't
valid UTF-8, despite appearing to be a text file.

Otherwise, looks good; nice idea!

-Eli
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