Add output of a few front page examples in explanations.
Catch #:row-var parsing problems in TR

Closes PR 14434
Make parse-type errors align with new Racket style
Revert "Add output of a few front page examples in explanations."

This reverts commit a5bc367b89eb8fe5ce4f2b684fde6deb6d759bfb.
Add initial failing fair vec/e tests
Add cantor n-tupling vec/e with slow but correct decode
Implement efficient n-tupling decode (not very efficient tho...)
Explicitly distinguish between cantor and box pairing vec/e and list/e
Implement fast fair boxy list/e
Use mixed fair and finite list/e and delete unused test file
fix object/c & fields that just have to exist

closes PR 14437
Post-release version for the v6.0.1 release
Allow functions with rest args in with-handlers.
raco decompile: fix for `#%foreign`

Merge to v6.0.1
racket/undefined: remove `undefined?` and `check-not-undefined`

The intent is to provide a minimal bridge between the current Racket
and one where `(letrec ([x x]) x)` no longer works.

Merge to v6.0.1
Preserve source locations.
Show a REPL type printing example in the TR guide

Please merge to v6.0.1
Fix `identifier-binding` docs and types

Closes PR 14262

Please merge to v6.0.1
Fix internal-external name mapping for TR classes

Please merge to v6.0.1
Fix types in typed/file/gif

Thanks to WarGrey Gyoudmon Ju for reporting the bug

Please merge to v6.0.1