fix error message handling

closes PR 13859
save recent drracket internal error exn records to include in PRs
remove bogus error (introduced to try out recent changes)
[Style] getting started
[Style] fixes
[Style] test of email
[Style] notes to myself
[Style] living up to Matthew's standard on guidelines
[Style] robby's reactions
[Style] Some minor changes
[Style] @compare plus some rules on use of constructs
[Style] use `racketmodname' to link to a language name
[Style] typo-level fixes etc
[Style] some of Robby's suggestions
[Style] ...
[Style] table, names, size
[Style] modules and tables
[Style] fixing typos, added Robby's commit bomb prose
[Style] added branch
[Style] first round of edits