Slava Pestov 2d4b25960d Sema: Type variables for opened generic parameters store the generic parameter type and not an archetype ...

There's no need to instantiate archetypes in the generic environment
of the declaration being opened.

A couple of diagnostics changed. They were already misleading, and the
new diagnostics, while different, are not any more misleading than
before.

2018-09-27 20:49:23 -07:00

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