Spaces missing in “divide by zero” error message

[PhelypeOleinik]

The code:

\documentclass{article}
\usepackage{tikz}
\begin{document}
\tikz \draw (1/0,0) -- (1,1);
\end{document}

produces the error message:

! Package PGF Math Error: You'veaskedmetodivide`1'by`0',butIcannotdivideanynumb
erby`0' (in '1/0').

See the PGF Math package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.4 \tikz \draw (1/0,0)
                        -- (1,1);
?

If I didn't know better I'd say someone loaded expl3 in PGF--TikZ ;-)

[josephwright]

In a sense it is :) If you do a quick trace, you find

\pgfmath@declarefunction #1#2->\pgfmath@namedef {pgfmath@function@#1}{#1}\pgfma
th@namedef {pgfmath@operation@#1@type}{function}\pgfmath@namedef {pgfmath@opera
tion@#1@arity}{#2}\pgfmath@namedef {pgfmath@operation@#1@infix}{#1}\pgfmath@nam
edef {pgfmath@operation@#1@precedence}{1000}\expandafter \ifx \csname pgfmath@o
peration@#1@arity\endcsname \pgfmath@dots \pgfmath@namedef {pgfmath@operation@#
1@arity}{1}\else \ifnum \csname pgfmath@operation@#1@arity\endcsname >9\relax \
pgfmath@namedef {pgfmath@operation@#1@arity}{1}\fi \fi \edef \pgfmath@marshal {
\noexpand \pgfmath@@declarefunction {\expandafter \noexpand \csname pgfmath#1\e
ndcsname }{\expandafter \noexpand \csname pgfmath#1@\endcsname }{\csname pgfmat
h@operation@#1@arity\endcsname }}\begingroup \catcode `\	=9\relax \catcode `\ =
9\relax \catcode `\~=10\relax \endlinechar =`\ \relax \pgfmath@marshal 

which you'll see ends with setting space to ignore, ~ to a space and \endlinechar to a space.

[hmenke]

BTW, this broke when fixing this #508