[Distutils] extras in PEP-426

[Robert Collins]

https://www.python.org/dev/peps/pep-0426/#extras-optional-dependencies

Gives an example of:

"name": "ComfyChair",
"extras": ["warmup", "c-accelerators"]
"run_requires": [
  {
    "requires": ["SoftCushions"],
    "extra": "warmup"
  }
]
"build_requires": [
  {
    "requires": ["cython"],
    "extra": "c-accelerators"
  }
]


But I am not sure how to map the current setuptools example below to PEP-426:

extras_require={
    'warmup': ['softcushions', 'barheater'],
    'c-accelerators': ['cython', 'barheater'],
    }

Would we expect multiple build_requires that list barheater, with
separate extra lines, in PEP-426?

Like so (adjusted to be all run-requires as extra setup-requires
aren't a thing in setuptools today):
"name": "ComfyChair",
"extras": ["warmup", "c-accelerators"]
"build_requires": [
  {
    "requires": ["SoftCushions","barheater"],
    "extra": "warmup"
  }
]
"build_requires": [
  {
    "requires": ["cython", "barheater"],
    "extra": "c-accelerators"
  }
]

Since build_requires is a key, I'm more than a little confused here.
Seems like the extra has to be part of the key, or we're going to be
uhm, stuck.

-Rob

-- 
Robert Collins <rbtcollins at hp.com>
Distinguished Technologist
HP Converged Cloud