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Warning 33 incorrectly triggered in recursive module #7553
Original bug ID: 7553
jbuilder recommends a recursive module pattern to allow the content of an .mli file to be turned into an equivalent .ml file, but this appears to have unearthed a bug in Warning 33.
Steps to reproduce
Create a.mli containing
type foo = Foo
and b.mli containing
open A type bar = Bar of foo
then create b.ml to be
module rec B : sig open A (* i.e. the contents of b.mli *) type bar = Bar of foo end = B include B
When compiled, Warning 33 is incorrectly emitted:
$ ocamlc -w +a a.mli b.mli b.ml File "b.ml", line 2, characters 2-8: Warning 33: unused open A.
Comment author: @lpw25
The following patch fixes it:
Although it would probably be better to give [type_open] a [check] parameter that turned the usage warning off rather than abuse the fact that currently [open!] doesn't trigger that warning.