Extension definition not found if defined in submodule.

[jj651a]

Lets have these modules:

main.yang

module main {
  yang-version 1.1;
  namespace "urn:example:main";
  prefix main;

  include main-sub;

  container x {
    main:foo "hello";
  }
}

main-sub.yang

submodule main-sub {
  yang-version 1.1;
  belongs-to main {
    prefix main; 
  }

  extension foo {
    argument bar;
    description "An example extension defined in a submodule.";
  }
}

$ ls -1
main-sub.yang
main.yang
$ yanglint -p . main.yang 
libyang err : Extension definition of extension instance "main:foo" not found. (/main:x/{extension='main:foo'})
$ yanglint -v
yanglint 4.2.2

i also tested development branch with the same results. b9d150a2af54d9b5250c071ecd6f98ea26b5decc

[michalvasko]

Strangely this was not reported before but I suppose extensions in submodules are not common. Should be fixed.