Info.TerminalSourcesemantic_value term is Some typ if terminal term has a semantic value of type typ, or None for unparameterized terminals.
val intersect :
'g grammar ->
'g n Utils.Misc.indexset ->
'g n Utils.Misc.indexset ->
'g n Utils.Misc.indexsetWrapper around IndexSet.inter speeding-up intersection with all
Is it the special `error` symbol
val find :
'g grammar ->
?approx:int ->
string ->
('g n Fix.Indexing.index, (int * string * 'g n Fix.Indexing.index) list)
Stdlib.result