[ruby/yarp] fix: StatementsNode with out-of-order body nodes

The presence of the heredocs in this snippet with invalid syntax:

    for <<A + <<B
    A
    B

causes the MissingNode to have a location after other nodes in the
list, resulting in a StatementsNode with inverted start and end
locations:

      [ForNode(0...14)(
         MultiWriteNode(4...7)([InterpolatedStringNode(4...7)((4...7), [], (14...16))], nil, nil, nil, nil),
         MissingNode(16...16)(),
    >    StatementsNode(16...14)(
           [MissingNode(16...16)(), InterpolatedStringNode(10...13)((10...13), [], (16...18)), MissingNode(13...14)()]
         ),
         (0...3),
         (16...16),
         nil,
         (14...14)
       )]

which failed an assertion during serialization.

With this fix, the node's locations are:

      [ForNode(0...14)(
         MultiWriteNode(4...7)([InterpolatedStringNode(4...7)((4...7), [], (14...16))], nil, nil, nil, nil),
         MissingNode(16...16)(),
    >    StatementsNode(10...16)(
           [MissingNode(16...16)(), InterpolatedStringNode(10...13)((10...13), [], (16...18)), MissingNode(13...14)()]
         ),
         (0...3),
         (16...16),
         nil,
         (14...14)
       )]

Found by the fuzzer.

https://github.com/ruby/yarp/commit/09bcedc05e

0 files changed, 0 insertions, 0 deletions