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These two rules require access to the GT.common library, which is only available with the GT package installed.
The mdx tests `#require "GT"`. Because dune sandboxes testing operations such as mdx, even tho the mdx tests are associated with the `GT` package, dune will not assume this means the GT package should be available to operations *insde* the mdx rules, unless the package dependency is made explicit.
This was referenced Oct 20, 2026
shonfeder
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mdx tests and camlp5 code gen assumes the package is available, thus requiring an explicit dependency on the package. The upstream fix is submitted at PLTools/GT#35. This bound will prevent noise from irrelevant revdeps failures for published versions.
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Three of the build targets were depending on the
GTpackage being in scope, but weren't declaring that dependency.From dune's perspective, this dependency specification has always been missing for these rules, but prior to 3.25 (release pending), the dependency isolation was too lax to catch the omission.
More context can be found at ocaml/dune#16617 (comment)