boundType does not support Any

[gmarques33]

Same as #619

This piece of code:

@ContributesMultibinding(ActivityInjection::class, boundType = Any::class)
class TestViewModel @Inject constructor() : SimpleStackViewModel() {
...
}

Will throw the follow error:

com.squareup.anvil.compiler.api.AnvilCompilationException: Back-end (JVM) Internal error: com.squareup.anvil.annotations.ContributesMultibinding contributes a binding for kotlin.Any, but doesn't extend this type.

The ContributesBindingGenerator works correctly and the test introduced in https://github.com/square/anvil/pull/623/files passes, if there's a component the BindingModuleGenerator will fail when merging the classes.

The following test fails:

  @Test fun `the contributed multibinding class can extend Any explicitly`() {
    compile(
      """
      package com.squareup.test

      import com.squareup.anvil.annotations.MergeComponent
      import com.squareup.anvil.annotations.ContributesMultibinding

      @ContributesMultibinding(Int::class, boundType = Any::class)
      interface ContributingInterface

      @MergeComponent(
        scope = Int::class,
      )
      interface ApplicationComponent
      """,
      ) {
      assertThat(this.exitCode).isEqualTo(ExitCode.OK)
    }
  }