Bugs found with Crowbar

[stedolan]

Bugs found in OPAM packages:

xmldiff: zoggy/xmldiff#4
calendar: https://forge.ocamlcore.org/tracker/index.php?func=detail&aid=1748&group_id=83&atid=415
yojson: ocaml-community/yojson#20 (reproduced, not originally found with crowbar)
cbor: ygrek/ocaml-cbor#1
bson: MassD/bson#16
bes: (via email)
uunf: dbuenzli/uunf#8, dbuenzli/uunf#10
bencode: rgrinberg/bencode#4
fpath: dbuenzli/fpath#10

@yomimono did some serious testing of charrua-core:
charrua-core: mirage/charrua#47, mirage/charrua#48, mirage/charrua#48, mirage/charrua#49, mirage/charrua#50, mirage/charrua#51, mirage/charrua#52, mirage/charrua#53, mirage/charrua#54, mirage/charrua#55

[dinosaure]

decompress:

• scope & clash of name
• scope & clash of name

[314eter]

hpack:

• 314eter/ocaml-hpack@556ebb2
• 314eter/ocaml-hpack@d4f270c

[emillon]

We started using crowbar to fuzz ocamlformat and found plenty of edge cases. Thanks! I created a label for issues and PRs:

https://github.com/ocaml-ppx/ocamlformat/issues?utf8=%E2%9C%93&q=label%3Afuzz

[smelc]

irmin, shallow content trees were changing the parent tree's hash: mirage/irmin/issues/1284