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# Embedded Interfaces in aux_files
Embedded interfaces in `aux_files` generate `unknown embedded interface XXX` errors.
See below for example of the problem:
```go
// source
import (
alias "some.org/package/imported"
)
type Source interface {
alias.Foreign
}
```
```go
// some.org/package/imported
type Foreign interface {
Embedded
}
type Embedded interface {}
```
Attempting to generate a mock will result in an `unknown embedded interface Embedded`.
The issue is that the `fileParser` stores `auxInterfaces` underneath the package name
explicitly specified in the `aux_files` flag.
In the `parseInterface` method, there is an incorrect assumption about an embedded interface
always being in the source file.
```go
case *ast.Ident:
// Embedded interface in this package.
ei := p.auxInterfaces[""][v.String()]
if ei == nil {
return nil, p.errorf(v.Pos(), "unknown embedded interface %s", v.String())
}
```
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