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A type parameter with default value is using forward declared identifier.
Erroneous code example:
```compile_fail,E0128
struct Foo<T = U, U = ()> {
field1: T,
field2: U,
}
// error: generic parameters with a default cannot use forward declared
// identifiers
```
Type parameter defaults can only use parameters that occur before them. Since
type parameters are evaluated in-order, this issue could be fixed by doing:
```
struct Foo<U = (), T = U> {
field1: T,
field2: U,
}
```
Please also verify that this wasn't because of a name-clash and rename the type
parameter if so.
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