scribble docs typo
macro docs extraneous char
Fix error source location access for struct refactor.
Fix contracted TR build.
Fix type in error case
Fix TR contracts.
Turn off TR contracts.
fix a bug in is-a?

This bug has been in is-a? since at least 5.2; it turns some errors
into #f. Hopefully no code is actually relying on this bad behavior...
missed another spot for the vector => exn-info change

this fixes another bug in commit 3474d091
Fix Reference typos
move boolean to the last production to avoid breaking
the random generation tests
adjust syncheck tests to cope with test inputs
whose size is not known until the test suite runs
find the ryr-test failure and make a small example; also
make the ryr test print the entire url when it runs
missed a spot in 33b65f5ec
fix responsible
remove bogus tests

tests were invalidated by commit 299063d (check syntax doesn't record
that information anymore)
add note to HISTORY about the is-a? bug fix
fix tl-test.rkt
dont open the initial window if a window has already
been opened via the application-file-handler

closes PR 13811
adjust DrRacket to still start up if all of the splash-related images
are broken

I don't know if this really closes PR 13794 but DrRacket does now
pass the error given in that PR.