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[Liberty-eiffel] Feature "is once then"

From: Paolo Redaelli
Subject: [Liberty-eiffel] Feature "is once then"
Date: Fri, 26 Jun 2015 08:44:10 +0200

I found this little line in

backtrack_next_pcdata_marker: UNICODE_STRING is once then U"__#PCDATA__" end

and it's puzzling me. Ok, the compiler tells me that "is" is deprecated.
I never found the "once then" syntax....

I looked into ECMA 367 and on the web but I coulnd't find any reference to such a syntax.

What does it mean?

  Paolo who would like to have an Eiffel to _javascript_ transcompile

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