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A opt-pilot constraint such as:

c1: CONSTRAINT, EXPR="fabs(rms_x)<1.5e-2";

constrs: CONSTRAINTS = (c1);

gives:

Error>
Error> *** Parse error detected by function "OpalParser::parseDefine()"
Error> *** in line 46 of file "RingOpt.in" before token ",":
Error>     The object "CONSTRAINT" is unknown.

This is because the keyword CONSTRAINT is not skipped in AbsFileStream.

I will fix this there.

One concern is that CONSTRAINT is also a keyword in the match routine: https://gitlab.psi.ch/OPAL/src/blob/master/src/Match/MatchParser.cpp.

However, as far as I can see this is currently not in OPAL? Quoting the manual: "Please note this is not yet available in: DOPAL-t and DOPAL-cycl." @adelmann can you confirm?