[Archlinux][Vala 0.46.0] pamac building fails in /src/tray.vala

Hello.

As usual, when Vala is upgraded to a new major version, pamac cannot be built successfully.

Error log:

[28/68] Compiling Vala source ../src/t...a ../src/tray-gtk.vala src/pamac.vapi.
FAILED: src/25a6634@@pamac-tray@exe/tray.c src/25a6634@@pamac-tray@exe/tray-gtk.c 
valac -C --debug --debug --pkg posix --pkg libnotify --pkg gtk+-3.0 --color=always --directory src/25a6634@@pamac-tray@exe --basedir ../src --pkg=posix --target-glib=2.38 ../src/tray.vala ../src/tray-gtk.vala src/pamac.vapi
../src/tray.vala:50.3-50.17: error: Creation method of abstract class cannot be public.
		public TrayIcon () {
		^^^^^^^^^^^^^^^
Compilation failed: 1 error(s), 0 warning(s)
[33/68] Compiling C object 'src/25a6634@@pamac@exe/meson-generated_cli.c.o'.
ninja: build stopped: subcommand failed.
==> ERROR: A failure occurred in build().

And for vala?

$ vala --version       
Vala 0.46.0

Sorry for reporting another build crasher bug :(