[WIP] [Stdlib] Eliminate SubSequence from _Indexable. #9276
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Make this routine suppress diagnostics when there is no source-location information (which allows it to be used as a query) and to distinguish the "we couldn't substitute into a requirement" failure mode from the "a requirement actually failed" failure mode.
Extend SubstOptions, which controls how substitution is performed, to allow the caller to subst() to provide a callback function that may provide a type witness for a normal protocol conformance that is undergoing type witness inference. In effect, it's allowing us to provide tentative bindings for type witnesses so we can see the effects of substitution.
…signature When we have a potential assignment of associated types to type witnesses during associated type inference, check that set of type witnesses against the requirements in the requirement signature, so that we can reject any solutions that fail some of the protocol's requirements. This is most of rdar://problem/31830524 --- but gets thwarted by the inability of associated type inference to work across multiple protocols.
This is intended to fix ABI FIXMEs swiftlang#178 and swiftlang#180, as well as rdar://problem/31830524, given that rdar://25214066 is mostly fixed, but we still run into associated type inference issues. Sigh.
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No longer relevant; I'm going to tackle this head-on as part of implementing the standard library part of SE-0157: Recursive Protocol Constraints in a single PR. |
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This is intended to fix ABI FIXMEs #178 and #180, as well as
rdar://problem/31830524, given that rdar://25214066 is mostly fixed,
but we still run into associated type inference issues. Sigh.