What does this Zig snippet output?

1const std = @import("std");
2pub fn main() void {
3    const ErrorA = error{Foo};
4    const ErrorB = error{Bar};
5    const Combined = ErrorA || ErrorB;
6    const e: Combined = error.Foo;
7    std.debug.print("{s}\n", .{@errorName(e)});
8}