etcd tree drives snapcraft dump plugin insane

Managed to get an infinite loop of copying under way with this snapcraft.yaml:

name: etcd
version: 3.0.6+master # this branch tracks upstream master
summary: Distributed key-value store # 79 char long summary
description: |
  Etcd provides a key-value store and is implemented for high availability,
  using the RAFT algorithm to deal with failover within the etcd cluster.
  Popular in the Docker community as a shared store of small but important
  pieces of common data in an application.
confinement: devmode # use "strict" to enforce system access only via declared interfaces

apps:
  etcd:
    command: bin/etcd
  etcdctl:
    command: bin/etcdctl

parts:
  etcd:
    plugin: dump
    source: .
    stage:
      - bin/*