Depending on alias is not transitive

[ejgallego]

Hi folks,

I'm not sure if this intended but posting here for discussion. Assume a dune file:

(alias
 (name foo)
 (deps (source_tree dir)))

(rule
 (alias bar)
 (deps (alias foo))
 (action (with-stdout-to out (bash "cat dir/dep"))))

dune build @bar will build out correctly the first time; however it we update dir/dep out is not rebuilt.

Dune 2.5.1 (back to 2.1.1), OCaml 4.10, Linux

[ghost]

This looks like a bug indeed. Morally, depending on (alias foo) should depend on the expansion of foo, which should include dir/dep because of the (deps (source_tree dir)).

[aalekseyev]

This issue should be fixed by #4303.