Context cancellation and returned error

[Pierre Durand]

My code has a select with a case that waits for context cancellation.

Currently I'm doing this:

case <-ctx.Done():
return ctx.Err()

I noticed that some libraries and the stdlib are doing this:

case <-ctx.Done():
return context.Cause(ctx)

What is the best practice ?

[Axel Wagner]

The latter. ctx.Err() can only return the context-specific errors, while context.Cause can also return the error passed using WithCancelCause.

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