bug in parsing about js-yaml HOT 3 CLOSED

That sentence is just a clarification of the context around it.
You've taken it on its own to be an assertion/property of YAML, but it doesn't make sense outside the context at
https://yaml.org/spec/1.2.2/#example-mapping-between-sequences

The point of the sentence is to say that (from the examples that follow the statement) you can do this:

? - Detroit Tigers
  - Chicago cubs
: - 2001-07-23

instead of this:

?
  - Detroit Tigers
  - Chicago cubs
:
  - 2001-07-23

and this:

- item    : Super Hoop
  quantity: 1

instead of this:

-
  item    : Super Hoop
  quantity: 1

from js-yaml.

For the record, a: b: c: d: - 1 is invalid YAML and this is not a "bug i n parsing".

YAML doesn't support compact block mappings

key: key: value   # wrong

even though it does support compact block sequences:

- - - value
# same as
-
  -
    - value

and also compact block mapping in sequence:

- - key1: value1
    key2: value2
# same as
-
  -
    key1: value1
    key2: value2

from js-yaml.

Thanks for the clarifications. In my honest opinion, the spec could have been a bit more precise and express syntax in a more conventional, formal way. Alas, we shall have to live with it.

from js-yaml.