Cannot distinguish between foo: and foo: ~

[not-my-profile]

I'd like to deserialize foo: as an empty mapping/sequence and treat foo: ~/foo: null as an error.

Unfortunately this isn't currently possible with yaml-rust2 because it emits a non-existing ~ Scalar event:

% cargo run --bin dump_events <(echo 'foo:')
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.03s
     Running `target/debug/dump_events /proc/self/fd/11`
      ↳ StreamStart
      ↳ DocumentStart
      ↳ MappingStart(0, None)
      ↳ Scalar("foo", Plain, 0, None)
      ↳ Scalar("~", Plain, 0, None)
      ↳ MappingEnd
      ↳ DocumentEnd
      ↳ StreamEnd