[Vala] array concatenation not supported temporarily or permanently?

[Nor Jaidi Tuah <norjaidi tuah ubd edu bn>]

I noticed the following git commit message:
"codegen: Report error on unsupported use of array concatenation",
and the following error message in the submitted code:
"Array concatenation not supported for public array variables".

Is this a temporary fix, or an unavoidable "feature"
of vala? It feels so uncool and so unvala.

hand
Nor Jaidi Tuah