DsIdentitiesFound -> 4214

[PPKFS]

[BinderDavid]

Corresponds to the warning -Widentities:

Causes the compiler to emit a warning when a Prelude numeric conversion converts a type T to the same type T; 
such calls are probably no-ops and can be omitted. 
The functions checked for are: toInteger, toRational, fromIntegral, and realToFrac.

GHC issue tracker which introduced this: https://gitlab.haskell.org/ghc/ghc/-/issues/4488