whichKeyKind method
Implementation
Expr_CreateStruct_Entry_KeyKind whichKeyKind() =>
_Expr_CreateStruct_Entry_KeyKindByTag[$_whichOneof(0)]!;
Expr_CreateStruct_Entry_KeyKind whichKeyKind() =>
_Expr_CreateStruct_Entry_KeyKindByTag[$_whichOneof(0)]!;