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josh11bandRichard Smith
2d567f5824
Change the syntax for setting the associated constants and types in an interface implementation for a type from using `let` declarations as in:
```
class Vector(T:! Type) {
impl as Iterable {
let ElementType:! Type = T;
...
}
}
```
to using `where` clauses as in:
```
class Vector(T:! Type) {
impl as Iterable where .ElementType = T {
...
}
}
```
This is an attempt to simplify by removing redundancy, improve consistency by removing a use of `let` that was different than other examples, and better support forward declaration that a type implements an interface while retaining the information needed for type checking.
Co-authored-by: Richard Smith <richard@metafoo.co.uk>
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