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cmd/cover: Allow specifying uncovered lines #12504

brunokim opened this issue Sep 4, 2015 · 2 comments

cmd/cover: Allow specifying uncovered lines #12504

brunokim opened this issue Sep 4, 2015 · 2 comments


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brunokim commented Sep 4, 2015

In this reddit discussion, /u/jerf has a nice suggestion: label lines that should be impossible to reach to improve coverage. Something like follows:

res, err := prudentFunction("constant")
if err != nil {
  panic(fmt.Sprintf("The impossible has happened: %v", err)) // gocover: Ignore

The coverage tool could then instrument the line and ignore it if there are 0 passes, and issue an error if there were more than zero.

@ianlancetaylor ianlancetaylor added this to the Unplanned milestone Sep 4, 2015
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CC @robpike

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robpike commented Sep 5, 2015

No, thanks. I dislike tools forcing people to annotate their code to silence them. That is, I dislike these annotations - they're not about the code, only about the tools that analyze the code.

@robpike robpike closed this as completed Sep 5, 2015
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