Set error field when detecting duplicate switch label
Set error field when detecting duplicate switch label

themiwi/vala,frida/vala,rvu95/vala,flobrosch/vala-fixes,spidermonkdust/vala,playya/vala,frida/vala,GNOME/vala,jessevdk/vala,tjol/vala-tjol,spidermonkdust/vala,tjol/vala-tjol,severinh/vala,frida/vala,playya/vala,jessevdk/vala,GNOME/vala,kamanashisroy/aroop,Distrotech/vala,GNOME/vala,themiwi/vala,tjol/vala-tjol,kamanashisroy/aroop,Distrotech/vala,flobrosch/vala-fixes,frida/vala,frida/vala,severinh/vala,kamanashisroy/aroop,flobrosch/vala-fixes,Distrotech/vala,GNOME/vala,rvu95/vala,themiwi/vala,playya/vala,spidermonkdust/vala,rvu95/vala,xdave/pvala,jessevdk/vala,severinh/vala