The intention of the code:
```haskell
let count = Map.findWithDefault 0 claferIdent identCountMap'
modify (\e -> e { identCountMap = Map.alter (\_ -> Just (count+1)) claferIdent identCountMap' } )
```

is more readable and concises as:
```haskell
modify (\e -> e { identCountMap = Map.insertWith (+) claferIdent 1 identCountMap' })
```