Improve diagnostics for invalid mutation through overloaded operators#62468

Merged

bors merged 2 commits intomasterfrom

mutable-overloaded-operators

Jul 13, 2019

Commits on Jul 7, 2019

Move `BorrowedContentSource` from move_errors to error_reporting
matthewjasper
committed
Add help message for mutation though overloaded place operators
matthewjasper
committed