* missing features
************************************************************************
+- .` "macro" not implemented (see gnu/usr.bin/cvs/man/cvs.1)
+ found by Anthony Bentley (anthonyjbentley@gmail.com)
+ 06/01/10 23:48 on tech@openbsd
+
- explicit blocks with missing end macro should be implicitely closed
at the end of the enclosing block, e.g. .Bl It (El) Sh
reminded by stsp@ in net/pptp pptp.8 Fri, 23 Apr 2010 20:32:39 +0200
.Bl -column
.It foo Ta bar
.El
+
+- explicitly disallow nested `Bl -column', which would clobber internal
+ flags defined for struct mdoc_macro
+
+- set a meaningful default if no `Bl' list type is assigned
+
+- have a blank `It' head for `Bl -tag' not puke
************************************************************************
* formatting issues: ugly output