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Editorial Team
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Asked: 2026-06-03T16:00:31+00:00

When logging in Go with log.Println , I frequently get 2012/05/13 16:45:50 evaluating %v(PANIC=3)

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When logging in Go with log.Println, I frequently get

2012/05/13 16:45:50 evaluating %v(PANIC=3)

I’m not sure how to determine what I’ve done wrong, I assume that somewhere fmt.Println has caught a panic generated by one of my own Stringer interface implementations, so as not to crash my program due to logging failure.

How do I work out what’s going on? Why am I getting this erroneous message?

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1 Answer

  1. Editorial Team

    You are right, there is a panic in a String method. But it has nothing to do with the log package. Println uses %v, and %v means running String method. Having a panic in the String method invokes catchPanic. Here in your output 3 is the value of your panic.

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