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[Groff] devpdf U-fonts and Russian

From: Piotr Piatrou
Subject: [Groff] devpdf U-fonts and Russian
Date: Thu, 05 Oct 2017 20:32:34 +0300
User-agent: KMail/4.13.3 (Linux/4.2.0-42-generic; KDE/4.13.3; x86_64; ; )

Hello, all

I am trying to use the "unicode" front families for typesetting a PDF 
document in Russian but get a compilation error like:

Invalid negative number (-1) in chr at /usr/bin/gropdf line 3201, <> 
line 325.

Interestingly, the one-line text compiles all right an the error 
happens, most likely, at the attempt to make line transition. 
Another strange thing is that, in case of using mixed Russian/Latin 
symbols in pic and tbl objects, the Latin letters and numbers 
become mis-positioned.

I wonder what I am possibly do wrong. The GROFF version is 1.22.2 
on Ubuntu 14.04. The compilation command used is:

groff -Kutf8 -pet -Tpdf RuRest.rof > RuTest.pdf

A maximally simplified file demonstrating the error is attached.

I would be grateful for any hint. Sincerely,
Piotr Piatrou

Attachment: RuTest.rof
Description: Text document

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