Mark Lacey 5f2aeec434 Implement a new "expression too complex" metric for Swift 4 mode. ...

Rather than waiting until we've used a huge amount of memory, attempt to
make the choice to bail out based on the number of type bindings /
disjunction choices we visit.

I expect this will generally fail faster than the Swift 3 metric, but
will still only fail when we've got clearly exponential type checking
behvior.

Since we have multiple sources of exponential behavior today, I don't
want to make the bounds too tight. Once we fix some/most of that
behavior we can look at further tightening up the metric.

2017-01-10 22:09:11 -08:00

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