[Gmsh] Printf append regression

[G. D. McBain]

The appending version of Printf seems to have been broken recently. I updated the Gmsh sources from svn on Tue. 21 and recompiled and now a pair of commands of the form

Printf("Hello") > "hello.txt";
Printf(", World!") >> "hello.txt";

raises (e.g., run with "gmsh - hello.geo")

Error : 'hello.geo', line 2 : syntax error (>>)

This worked on Tue. 14, though I don't remember with which Gmsh version (2.16.0, but also compiled from svn).

This is on 64-bit Debian GNU/Linux 9.0 (stretch).

P. S. I was going to log this at [http://gitlab.onelab.info](http://gitlab.onelab.info/users) but couldn't register: "Email domain is not authorized for sign-up".
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