I don't think there's a way to color functions in Go. That's not terribly special, several languages have no colors in them.

returning error is a function color in Go. That you can discard the error is not relevant, since it creates an incorrect program. Failability is a color in all languages that don't handle it like C (everything is a crash) or like Java (everything can throw - it's not a color if everything is the same color).

Pedantically, colored functions in Go might be ones that produce their output on a channel rather than returning a value. Then, you need select/for-range/<- to get their result, similar to “await”.

Practically, the runtime’s ability to suspend and move goroutines around means that the impact of that (niche/rarely appropriate as a default approach) kind of coloring is much less in Go than in other languages.