rootPruning := orig.pruning
	for _, m := range mustSelect {
		if m.Path == "go" {
			rootPruning = pruningForGoVersion(m.Version)
			break
		} else if m.Path == "toolchain" && pruningForGoVersion(gover.FromToolchain(m.Version)) == unpruned {
			// We don't know exactly what go version we will end up at, but we know
			// that it must be a version supported by the requested toolchain, and
			// that toolchain does not support pruning.