Maintainers for valac are Debian GNOME Maintainers <pkg-gnome-maintainers@lists.alioth.debian.org>.
You may want to refer to the following packages that are part of the same source: libvala-0.42-0, libvala-0.42-dev, libvala-0.48-0, libvala-0.48-dev, libvala-0.56-0, libvala-0.56-dev, libvalacodegen-0.48-0, libvalacodegen-0.56-0, libvaladoc-0.42-0, libvaladoc-0.42-dev, libvaladoc-0.48-0, libvaladoc-0.48-data, libvaladoc-0.48-dev, libvaladoc-0.56-0, libvaladoc-0.56-data, libvaladoc-0.56-dev, libvaladoc-data, vala-0.42-doc, vala-0.48-doc, vala-0.56-doc, valac-0.42-vapi, valac-0.48-vapi, valac-0.56-vapi, valac-bin, valadoc.
You might like to refer to the valac package page, to the Package Tracking System, or to the source package src:vala's bug page.
If you find a bug not listed here, please report it.