=== Mapping in Mapping
--- events
StreamStart
DocumentStart
MappingStart
Scalar value 42
MappingStart
Scalar value 53
Scalar value 64
Scalar value 75
Scalar value 86
MappingEnd
Scalar value 11
Scalar value 99
MappingEnd
DocumentEnd
StreamEnd
--- yaml
42:
  53: 64
  75: 86
11: 99
