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

#write test.zig {
const Letter = extern union {
    A,
};
export fn entry() void {
    const a: Letter = .{ .A = {} };
    _ = a;
}
#}
#update
#check errors {
test.zig:2:5: error: union field missing type
#}
