Remove Pure attribute from System.Collections.Immutable#35118

Merged

stephentoub merged 2 commits intodotnet:masterfrom ericstj:immutable-pure

Apr 27, 2020

+2-445

Commits on Apr 17, 2020

Preserve Pure attribute in System.Collections.Immutable
ericstj
committed

Commits on Apr 20, 2020

Remove usage of [Pure] from Immutable Collections
ericstj
committed