csvfields v0.15 is not compatible with ocaml 5.0
Fails with
```
=== ERROR while compiling csvfields.v0.15.0 ==================================#
context 2.2.0~alpha~dev | linux/x86_64 | ocaml-base-compiler.5.0.0 | file:///home/opam/opam-repository
path ~/.opam/5.0/.opam-switch/build/csvfields.v0.15.0
command ~/.opam/opam-init/hooks/sandbox.sh build dune build -p csvfields -j 127
exit-code 1
env-file ~/.opam/log/csvfields-7-6e2984.env
output-file ~/.opam/log/csvfields-7-6e2984.out
(cd _build/default && /home/opam/.opam/5.0/bin/ocamldep.opt -modules -impl ocaml-csv/lib/csv.ml) > _build/default/ocaml-csv/lib/.csvlib.objs/csvlib__Csv.impl.d
File "ocaml-csv/lib/csv.ml", line 101, characters 8-26:
101 | field_str.[i] <- x;
^^^^^^^^^^^^^^^^^^
Error: Syntax error: strings are immutable, there is no assignment syntax for them.
Hint: Mutable sequences of bytes are available in the Bytes module.
Hint: Did you mean to use 'Bytes.set'?
(cd _build/default && /home/opam/.opam/5.0/bin/ocamlc.opt -w -40 -w -3 -g -bin-annot -I xml-light/.xml_light.objs/byte -intf-suffix .ml -no-alias-deps -open Xml_light -o xml-light/.xml_light.objs/byte/xml_light__Xml_lexer.cmo -c -impl xml-light/xml_lexer.ml)
File "xml-light/xml_lexer.mll", line 283, characters 25-41:
Error: Unbound value String.lowercase
(cd _build/default && /home/opam/.opam/5.0/bin/ocamlc.opt -w -40 -w -3 -g -bin-annot -I xml-light/.xml_light.objs/byte -intf-suffix .ml -no-alias-deps -open Xml_light -o xml-light/.xml_light.objs/byte/xml_light__Dtd.cmo -c -impl xml-light/dtd.ml)
File "xml-light/dtd.ml", line 210, characters 14-30:
210 | let utag = String.uppercase tag in
^^^^^^^^^^^^^^^^
Error: Unbound value String.uppercase
(cd _build/default && /home/opam/.opam/5.0/bin/ocamlopt.opt -w -40 -w -3 -g -I xml-light/.xml_light.objs/byte -I xml-light/.xml_light.objs/native -intf-suffix .ml -no-alias-deps -open Xml_light -o xml-light/.xml_light.objs/native/xml_light__Xml_lexer.cmx -c -impl xml-light/xml_lexer.ml)
File "xml-light/xml_lexer.mll", line 283, characters 25-41:
Error: Unbound value String.lowercase
(cd _build/default && /home/opam/.opam/5.0/bin/ocamlc.opt -w -40 -w -3 -g -bin-annot -I xml-light/.xml_light.objs/byte -intf-suffix .ml -no-alias-deps -open Xml_light -o xml-light/.xml_light.objs/byte/xml_light__Xml.cmo -c -impl xml-light/xml.ml)
File "xml-light/xml.ml", line 129, characters 13-29:
129 | let att = String.lowercase att in
^^^^^^^^^^^^^^^^
Error: Unbound value String.lowercase
```
Signed-off-by: Marcello Seri <marcello.seri@gmail.com>
anil.recoil.org
mseri.me