Fix generated code when mixing closures and simple lambda expressions
Fix generated code when mixing closures and simple lambda expressions

Fixes bug 615444.

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