Improve syntax error message for missing type in foreach
Improve syntax error message for missing type in foreach

Fixes bug 635903.

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