* return interface from testing/util
* remove usages of v1
* return interface from InitializeFromProto
* return interface from InitializeFromProto
* fix test
* fix interface visibility
* more fixes
* use InitializeFromProtoUnsafe in testing/util
* return early error from mock
* v2
* fix tests
* remove unnecessary assertion
* use struct in nil state test
* Revert "Auxiliary commit to revert individual files from 6bb528c2c5df2446ad18450009f63f44318d41a9"
This reverts commit 7d70238a301209f6dbfc8ff1d81b16e33b0bd67d.
* use struct in sync committee test
* v3
* use InitializeFromProtoUnsafe in mock
* use version information
* Revert "Auxiliary commit to revert individual files from 6bb528c2c5df2446ad18450009f63f44318d41a9"
This reverts commit 5d5e6f2884d21caec7530c16ad2a0d0d27c44aa1.
* revert changes to ClearPreGenesisData
* fix build error
* remove error from PreGenesisState
* bzl
* Value assigned to a variable is never read before being overwritten
* The result of append is not used anywhere
* Suspicious assignment of range-loop vars detected
* Unused method receiver detected
* Revert "Auxiliary commit to revert individual files from 54edcb445484a2e5d79612e19af8e949b8861253"
This reverts commit bbd1e1beabf7b0c5cfc4f514dcc820062ad6c063.
* Method modifies receiver
* Fix test
* Duplicate imports detected
* Incorrectly formatted error string
* Types of function parameters can be combined
* One more "Unused method receiver detected"
* Unused parameter detected in function
* Move interfaces from github.com/prysmaticlabs/prysm/beacon-chain/state/interface to github.com/prysmaticlabs/prysm/beacon-chain/state
* remove/rename state2
