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Calling `findMember` in the enclosed test was calling into
`NonClassTypeRef#relativeInfo` an exponentially-increasing number
of times, with respect to the length of the chained type projections.
The numbers of calls increased as: 26, 326, 3336, 33446, 334556.
Can any pattern spotters in the crowd that can identify the sequence?
(I can't.)
Tracing the calls saw we were computing the same `memberType`
repeatedly. This part of the method was not guarded by the cache.
I have changed the method to use the standard idiom of using the
current period for cache invalidation. The enclosed test now compiles
promptly, rather than in geological time.
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