Proofview_monad.InfoInfo trace.
type tag = | | Msg of lazy_msg | (* A simple message*) | 
| | Tactic of lazy_msg | (* A tactic call*) | 
| | Dispatch | (* A call to  | 
| | DBranch | (* A special marker to delimit individual branch of a dispatch.*) | 
The type of the tags for info.
type state = tag Trace.incrtype tree = tag Trace.forestval print : Environ.env -> Evd.evar_map -> tree -> Pp.t