If SINGULAR does not come back to the prompt while calling a user defined procedure, probably a bracket or a " is missing. The easiest way to leave the procedure is to type some brackets or " and then RETURN .
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3.9.1 Tracing of procedures 3.9.2 Source code debugger 3.9.3 Break points 3.9.4 Printing of data 3.9.5 libparse