Slava Pestov cfe9e6a3de IDE: Use GenericSignatures and interface types (mostly) ...

There was a ton of complicated logic here to work around
two problems:

- Same-type constraints were not represented properly in
  RequirementReprs, requiring us to store them in strong form
  and parse them out when printing type interfaces.

- The TypeBase::getAllGenericArgs() method did not do the
  right thing for members of protocols and protocol extensions,
  and so instead of simple calls to Type::subst(), we had
  an elaborate 'ArchetypeTransformer' abstraction repeated
  in two places.

Rewrite this code to use GenericSignatures and
GenericFunctionType instead of old-school GenericParamLists
and PolymorphicFunctionType.

This changes the code completion and AST printer output
slightly. A few of the changes are actually fixes for cases
where the old code didn't handle substitutions properly.
A few others are subjective, for example a generic parameter
list of the form <T : Proto> now prints as <T where T : Proto>.

We can add heuristics to make the output whatever we want
here; the important thing is that now we're using modern
abstractions.

2016-10-02 23:49:15 -04:00

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