Khan/genqlient

Redo error-formatting utilities to be a bit more idiomatic

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#118 aberto em 28 de set. de 2021

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Description

We have our own errorf (in generate/errors.go) so that we can do structured errors with positions. But our errorf is a bit un-idiomatic (which caused confusion in #117) -- it just wraps the first error argument it finds rather than using %w -- and it also doesn't actually format wrapped errors in a very good way (e.g. here). We could probably do better, either having our wrapper do an ordinary fmt.Errorf (by formatting the position at call-time), or by making it a bit more idiomatic and using its extra structure to hoist the position to the outermost error.

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