What is wrong here?


Depends what you are trying to do? Are you sure # is the character you want, and not %? %U would print the unicode format, see https://golang.org/pkg/fmt/

It’s hard to tell you what is wrong when you are not telling us what the expected output is.

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I am trying to print every rune code point of the uppercase alphabet three times

You just need a percent sign in your format string:

fmt.Printf("\t%#U\n", i)


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