Fix editable-mode logic when pyproject.toml present#6370

Merged

cjerdonek merged 2 commits intopypa:masterfrom cjerdonek:editable-and-pep-517-optional

Apr 6, 2019

+234-80

Commits on Mar 31, 2019

Refactor install_backend_dependencies() out from prep_for_dist().
cjerdonek
committed
Require --no-use-pep517 if using editable mode with pyproject.toml.
cjerdonek
committed