Retain generic signature of TypeToken with R8 version 3.0 and higher #1930
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R8 version 3.0 started to remove generic signatures from items that are not matched by a -keep rule in full mode (see also https://r8.googlesource.com/r8/+/744d742137a82656b8ee27513f975e0528aecd78). The motivation for this change is to avoid that all generic signatures are retained in programs, when only a few are typically required for reflection.
This change adds a rule that causes the generic signatures of com.google.gson.reflect.TypeToken and its subclasses to be retained. This is needed because com.google.gson.reflect.TypeToken reflectively accesses its own generic signature.
References: