Doug Gregor c522bb5239 [GSB] Separate out "unresolved" and "direct" type requirement handling. ...

As we've done with layout requirements, introduce a new entry point
(addTypeRequirement) that handles unresolved type requirements of the
form `T: U`, resolves the types, and then can

1. Diagnose any immediate problems with the types,
2. Delay the type requirement if one of the types cannot be resolved,
or
3. Break it into one or more "direct" requirements.

This allows us to clean up and centralize a bunch of checking that was
scattered/duplicated across the GSB and type checker.

2017-04-07 16:53:11 -07:00

3.3 KiB

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