628 ;;Quote: an error handling system most avoid inaccurate messages

628+;;Quote: a system should be simple, reliable, and honest

628 ;;Quote: the best error message proposes a correction to the error; use only if known

628 ;;Quote: if an error may have multiple corrections then report each one

628 ;;Quote: reports syntax error by underlining all text which was skipped by compiler

628 ;;Quote: report a syntax error by listing the possible symbols at the error location

630 ;;Quote: a first order error if only one symbol possible; allows accurate error reporting; if two in a row, reports two close errors

631 ;;Quote: second order errors allow multiple symbols; must scan to the recovery symbol for that error; algorithm given