Reduce the number of `RefCell`s in `InferCtxt`.#68694

Merged

bors merged 1 commit intorust-lang:masterfrom nnethercote:reduce-RefCells-in-InferCtxt

Feb 10, 2020

+321-242

Commits on Feb 9, 2020

Reduce the number of RefCells in InferCtxt.
nnethercote
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