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Dana Jansensandjosh11b
f3a898bac0
If a type satisfies the requirements of a FacetType, then that type as a
value can be converted to a FacetValue, which binds the type value to
the FacetType.
For instance, if the class A implements an interface B, then
```
fn F(b:! B) {}
```
can be called with the type `A`
```
F(A);
```
This does not handle yet receiving non-type values matching a FacetType,
as that requires deducing the required FacetValue for the caller's
argument. Follow-up work will do this step.
---------
Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com>