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+Give a more helpful error message when the indent is set to a value
+greater than the line-length.
+
+Tracing. This is a pain to implement because requests are responsible
+for reading their own arguments.
+
+Possibly implement -s option (stop every N pages). This functionality
+would be more appropriate in a postprocessor.
+
+Line breaking should be smarter.  In particular, it should be possible
+to shrink spaces.  Also avoid having a line that's been shrunk a lot
+next to a line that's been stretched a lot.  The difficulty is to
+design a mechanism that allows the user complete control over the
+decision of where to break the line.
+
+Provide a mechanism to control the shape of the rag in non-justified
+text.
+
+Add a discretionary break escape sequence. \B'...'...'...' like TeX.
+
+Think about kerning between characters and spaces. (Need to implement
+get_breakpoints and split methods for kern_pair_node class.)
+
+In troff, if .L > 1 when a diversion is reread in no-fill mode, then
+extra line-spacing is added on. Groff at the moment treats line-spacing
+like vertical spacing and doesn't do this. 
+
+Suppose \(ch comes from a special font S, and that the current font is
+R. Suppose that R contains a hyphen character and that S does not.
+Suppose that the current font is R. Suppose that \(ch is in a word
+and has a non-zero hyphen-type. Then we ought to be able to hyphenate,
+but we won't be able to because we will look for the hyphen only in
+font S and not in font R.
+
+Variant of tm which doesn't write a newline.
+
+Perhaps the current input level should be accessible in a number register.
+
+Should \w deal with a newline like \X?
+
+Have another look at uses of token::delimiter.  Perhaps we need to
+distinguish the case where we want to see if a token could start a
+number, from the case where we want to see if it could occur somewhere
+in a number expression.
+
+Provide a facility like copy thru in pic.
+
+Fancier implementation of font families which doesn't group fonts into
+families purely on the basis of their names.
+
+In the DESC file make the number of fonts optional if they are all on
+one line.
+
+Number register to give the diversion level.
+
+Time various alternative implementations of scale (both in font.c and
+number.c). On a sparc it's faster to always do it in floating point.
+
+Devise a more compact representation for the hyphenation patterns trie.
+
+Have a per-environment parameter to increase letter-spacing.
+
+Number register to return character height.
+
+Number register to return character slant.
+
+Request to set character height.
+
+Request to set character slant.
+
+Provide some way to upcase or downcase strings.
+
+Support non-uniformly scalable fonts. Perhaps associate a suffix with
+a particular range of sizes.  eg
+  sizesuffix .display 14-512
+Then is you ask for R at pointsize 16, groff will first look for
+R.display and then R.  Probably necessary to be able to specify a
+separate unitwidth for each sizesuffix (eg. for X).
+
+Request to copy an environment into the current environment.
+
+Variant of `.it' for which a line interrupted with \c counts as one
+input line.
+
+Make it possible to suppress hyphenation on a word-by-word basis.
+(Perhaps store hyphenation flags in tfont.)
+
+Possibly allow multiple simultaneous input line traps.
+
+Unpaddable, breakable space escape sequence.
+
+Support hanging punctuation.
+
+In justified text, if the last line of a paragraph is only a little
+bit short it might be desirable to justify the line.  Allow the user
+control over this.
+
+Have a blank line macro like the end macro.  When a blank line macro
+has been set, then a blank line causes the blank line macro to be
+called rather than doing the equivalent of .sp.
+
+The pm request could print where the macro was defined.  Also could
+optionally print the contents of a macro.
+
+Provide some way to round numbers to multiples of the current
+horizontal or vertical resolution.
+
+Better string-processing support (substring, length, search).
+
+Generalized ligatures.
+
+Provide some way for a macro to tell whether it was called with `'' or
+`.'.  This would be useful for implementing a tracing macro package.
+
+Request to remove an environment. (Maintain a count of the references
+to the environment from the environment table, environment dictionary
+or environment stack.)
+
+Perhaps in the nr request a leading `-' should only be recognized as a
+decrement when it's at the same input level as the request.
+
+Don't ever change a charinfo.  Create new variants instead and chain
+them together.
+
+Make it possible to tr characters onto \~.
+
+Unix troff appears to read the first character of a request name in
+copy mode.  Should we do the same?
+
+Number register giving name of end macro.
+
+More thorough range checking.
+
+Provide syntax for octal and hexadecimal numeric constants.  Perhaps
+o#100 and x#7f as per Scheme.  Or perhaps PostScript 16#7f.  Ambiguity
+between whether `c' is treated as digit or scaling indicator.
+
+Request to return from a macro (ie ignore the rest of the current
+input level).