You can search for identifiers within the package.
in-package search v0.2.0
type flavor =
| FlavorOffset
| FlavorPosition
| FlavorLocation
type where =
| WhereSymbolStart
| WhereStart
| WhereEnd
type subject =
| Before
| Left
| RightNamed of string
type keyword =
| Position of subject * where * flavor
| SyntaxError
val posvar : subject -> where -> flavor -> string
module KeywordSet : sig ... end