Coverage: 95.765% (+0.04%) from 95.726% when pulling 534ab72 on k4n4ry:feature/impl-alias-support into e3fb65a on gavv:master.

Thanks for PR! Will review in upcoming days.

☔ The latest upstream change (presumably these) made this pull request unmergeable. Please resolve the merge conflicts.

Hi, please rebase your PR on fresh master. It has reworked chain interface.

Instead of:

	r.chain.enter("XXX()")
	defer r.leave()

	if r.failed() {
		return r
	}

we should now use:

	opChain := r.chain.enter("Decode()")
	defer opChain.leave()

	if opChain.failed() {
		return r
	}

In other words, chain.enter() now returns a new chain instance, and we should use it for all other operations with chain. This change is part of making this lib thread-safe.

Related commits:

• a961221
• 90675e1

The following changes in chain affect this PR:

• enter does not modify the chain now; instead it creates a clone, modifies this clone, and returns it
• leave does not modify the chain now; since enter returns a clone, we can just drop this clone
• fail is allowed only between enter/leave
• it's not allowed to call enter two times in a row; after first enter you should make a clone, and you can call enter again only on that clone
• replace also returns a clone, just like enter

Sorry for creating conflicts. I was waiting with my changes for a while, in hope that I'll find a time window when there are no active PRs and I can merge them without creating conflicts. However it seems that currently new PRs are coming too often and there is no such window :)

@gavv I rebased and fixed, so please check when you have time. Thank you.

Thank you! Solid work!

Two small follow-up commits:

• 6223d1f
• 565be64