src/ir.cpp: don't allow `@handle()` outside of a function;
src/ir.cpp: don't allow `@handle()` outside of a function;

Tracking Issue #1296 ;

raulgrell/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,andrewrk/zig,zig-lang/zig,Dimenus/zig,raulgrell/zig,andrewrk/zig,Dimenus/zig,raulgrell/zig,Dimenus/zig,zig-lang/zig