Array access sugar clash with ##

[chenglou]

(this##memoizedUpdaterCallbacks).(count) = 1;

Formats to

this##memoizedUpdaterCallbacks.(count) = 1;

Then throws parse error.

[SanderSpies]

Will pick this up after #941 lands.

[Schmavery]

In case it helps, I fixed an issue similar to this in #930, but guess I must have missed a case.

[chenglou]

Bumping this slightly as we've encountered this again

[chenglou]

Fixed in master