Michael Gottesman 44bd180d85 [moveOnly] Add a frontend flag -enable-experimental-move-only to control usage of move only features. ...

These include _move and @_noImplicitCopy. I still need to wire up the parsing of
those behind this feature.

The reason that I am adding this now is that I am going to now need to make some
changes behind a feature flag and I have not yet needed to add one. The specific
reason I needed to add one here is to ensure that I properly guard inside _move
the call to Builtin.move so as to prevent a "cond_fail" incident.

P.S.: This work depends on experimental lexical lifetimes being enabled as well,
so I did that at the same time in this PR.

2021-10-27 18:45:33 -07:00

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