John McCall fe7915d09e Rework a number of SIL and IRGen witness-table abstractions ...

to correctly handle generalized protocol requirements.

The major missing pieces here are that the conformance search
algorithms in both the AST (type substitution) and IRGen
(witness table reference emission) need to be rewritten to
back-track requirement sources, and the AST needs to actually
represent this stuff in NormalProtocolConformances instead
of just doing ???.

The new generality isn't tested yet; I'm looking into that,
but I wanted to get the abstractions in place first.

2017-03-02 01:34:13 -05:00

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