E (note.Note_brr.Consoler.E)

val log : 
  ?obs:bool ->
  ?l:Brr.Console.log ->
  ?v:'a Brr.Console.msgr ->
  string ->
  'a Note.event ->
  'a Note.event

event is like log_value on e's occurences. If obs is true the returned value is e itself and the tracing occurs through a logger; note that this prevents e from being garbage collected. If obs is false, the return value is e mapped by a side effecting identity.