Add more delegations to the fmt docs and add doctests#67253

Merged

bors merged 2 commits intorust-lang:masterfrom

elichai:2019-12-fmt

Dec 20, 2019

Commits on Dec 12, 2019

Change fmt docs for more delegations
elichai
committed

Commits on Dec 15, 2019

Replace prints in fmt docs with asserts
elichai
committed