Doug Gregor e670ac42d9 Add command-line option -warn-implicit-overrides. ...

When provided, this flag warns about implicit overrides, where a
declaration overrides another declaration but is not marked with the
‘override’ keyword. The warning can be suppressed by either providing
‘override’ or ‘@_nonoverride’.

At present, this only happens with overrides in protocols.

2018-09-04 16:42:06 -07:00

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