ContributesSubcomponent.Factory validation fails when the function is inherited and returns a generic

[RBusarow]

There are a number of places in Subcomponent factory validation where Anvil hasn't been resolving the generic return types of the factory function. For example, in the following snippet, create() returns SubcomponentInterface but it's only treated as the T type variable.

package com.squareup.test

import com.squareup.anvil.annotations.ContributesSubcomponent

@ContributesSubcomponent(Any::class, parentScope = Unit::class)
interface SubcomponentInterface {
  @ContributesSubcomponent.Factory
  interface ComponentFactory : GenericFactory<SubcomponentInterface>
}

interface GenericFactory<T> {
  fun create(): T
}

example exception:

Compilation failed unexpectedly

e: com.squareup.anvil.compiler.api.AnvilCompilationException: Back-end (JVM) Internal error: Unable to resolve type for T.
File is unknown

	at com.squareup.anvil.compiler.internal.DescriptorUtilsKt.classDescriptor(DescriptorUtils.kt:32)
	at com.squareup.anvil.compiler.internal.reference.TypeReferenceKt.AnvilCompilationExceptionTypReference(TypeReference.kt:503)
	at com.squareup.anvil.compiler.internal.reference.TypeReferenceKt.AnvilCompilationExceptionTypReference$default(TypeReference.kt:491)
	at com.squareup.anvil.compiler.internal.reference.TypeReference.asClassReference(TypeReference.kt:75)
	at com.squareup.anvil.compiler.codegen.ContributesSubcomponentCodeGen$Embedded.checkParentComponentInterface(ContributesSubcomponentCodeGen.kt:328)
	at com.squareup.anvil.compiler.codegen.ContributesSubcomponentCodeGen$Embedded.access$checkParentComponentInterface(ContributesSubcomponentCodeGen.kt:244)
        [...]