Missing front end error leading to spurious linker errors

[Lars-Kristiansen]

I've noticed this problem recently, dmd v2.109.1, linux, amd64.

to reproduce:

git clone https://gitlab.com/basile.b/harbored-mod.git
cd harbored-mod
dub build
echo "worked"
 
git checkout bug-missing-convert-error
dub build

so when init is used no problem, when I use defautlt ctor, linkers problems. Nice.

The real problem is that a front-end error is not issued. The third member does not implictly convert to null.

[Lars-Kristiansen]

add --force to dub too, although the bug happens w/o.

[dkorpel]

Can you reduce it to a self-contained example?