Fix #8933: Fix eta expansion when comparing hk types #8944
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We previously implemented a rule that A.this <: B.this if A and B are
mutually superclasses of the other's self type. We now apply that rule
only if A.this and B.this occur as prefixes in a comparison like
A.this.T <:< B.this.T
And we document why that choice was made.
smarter
approved these changes
May 11, 2020
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