Joe Groff a7a3b17597 Replace nominal type descriptors with a hierarchy of context descriptors. ...

This new format more efficiently represents existing information, while
more accurately encoding important information about nested generic
contexts with same-type and layout constraints that need to be evaluated
at runtime. It's also designed with an eye to forward- and
backward-compatible expansion for ABI stability with future Swift
versions.

2018-01-29 16:19:25 -08:00

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