#zig build-obj {
--name test -fno-emit-bin
-Mroot=test.zig
#}

#write test.zig {
export fn a() void {
    const b = blk: {
        break :blk break :blk @as(u32, 1);
    };
    _ = b;
}
#}
#update
#check errors {
test.zig:3:9: error: unreachable code
test.zig:3:20: note: control flow is diverted here
#}
