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Before this change, code like the following would crash the compiler:
```hlsl
interface IThing { /* ... */ }
struct Outer
{
struct Inner : IThing
{}
}
/* go on to use Outer.Inner */
```
The problem was that the front-end logic for checking interface conformances was *only* checking declarations at the top level of a module, or nested under a generic.
This change fixes the logic to recurse through the entire tree of declarations.
I have added a test case that uses a nested `struct` type to satisfy an associated type requirement, to confirm that the new check works as intended.
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