go/analysis/analysistest: Ignore error if edited file can't be formatted

[sourya]

There are instances when the diagnostics are reported correctly by the
analyzer, but the suggested fixes are wrong, and result in code that
cannot be formatted by format.Source (due to errors in the edited code).
Right now, in those cases, the tests pass despite the format errors.
This commit fixes that.

Signed-off-by: Sourya Vatsyayan [email protected]

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Patch Set 1:

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Message from Michael Matloob:

Patch Set 1:

I think it's definitely a problem that we don't even check suggested fixes if the file can't be formatted, so I think that instead of just continuing we should check against the unformatted code.

It's tricky to just outright fail if the file can't be formatted. Consider a file that has a syntax error, and someone makes a resilient analyzer that can make suggested fixes even in the presence of syntax errors. This change could make it difficult to test an analyzer like that.

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This PR (HEAD: 4f09fe5) has been imported to Gerrit for code review.

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Message from Michael Matloob:

Patch Set 3:

Hm, I'm not sure if this is right either. Most likely the message will be ignored.

I'm wondering if we can do the following: if the file fails to format, we check if the original file was able to be formatted: a suggested fix shouldn't break previously working code.

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Within the next week or so, a maintainer will review your change and provide
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tips to get your patch through code review.

Most changes in the Go project go through a few rounds of revision. This can be
surprising to people new to the project. The careful, iterative review process
is our way of helping mentor contributors and ensuring that their contributions
have a lasting impact.

During May-July and Nov-Jan the Go project is in a code freeze, during which
little code gets reviewed or merged. If a reviewer responds with a comment like
R=go1.11, it means that this CL will be reviewed as part of the next development
cycle. See https://golang.org/s/release for more details.

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