Throw an exception if mpfr_asprintf fails
Throw an exception if mpfr_asprintf fails

duncanmortimer/ledger,afh/ledger,jwakely/ledger,duncanmortimer/ledger,paulbdavis/ledger,duncanmortimer/ledger,jwakely/ledger,paulbdavis/ledger,paulbdavis/ledger,paulbdavis/ledger,jwakely/ledger,duncanmortimer/ledger,duncanmortimer/ledger,jwakely/ledger,ledger/ledger,paulbdavis/ledger,duncanmortimer/ledger,jwakely/ledger,jwakely/ledger,ledger/ledger,paulbdavis/ledger,ledger/ledger,paulbdavis/ledger,ledger/ledger,ledger/ledger,afh/ledger,afh/ledger,jwakely/ledger,duncanmortimer/ledger,afh/ledger,afh/ledger