When applied to a term that is either a constant or a variable, name_of
returns its name (its true name, even if there is an interface mapping for it
in effect). When applied to any other term, it returns the empty string.
FAILURE CONDITIONS
Never fails.
EXAMPLE
# name_of `x:int`;;
val it : string = "x"
# name_of `SUC`;;
val it : string = "SUC"
# name_of `x + 1`;;
val it : string = ""