[Python-modules-team] Bug#515634: python-yaml: YAML loader complains about non-unique anchors

[Paul Evans]

Package: python-yaml
Version: 3.08-1
Severity: normal


Given a small input file, such as

  - &anchor 1
  - &anchor 1

yaml.load() dies with an error:

  yaml.composer.ComposerError: found duplicate anchor 'anchor'; first occurence
    in "<string>", line 1, column 3:
      - &anchor 1
        ^
  second occurence
    in "<string>", line 2, column 3:
      - &anchor 1
        ^

This ought to be allowed; the YAML 1.1 spec says in 3.2.2.2:

  When composing a representation graph from serialized events, an alias node
  refers to the most recent node in the serialization having the specified
  anchor. Therefore, anchors need not be unique within a serialization. 


-- System Information:
Debian Release: 5.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages python-yaml depends on:
ii  libc6                         2.7-18     GNU C Library: Shared libraries
ii  libyaml-0-1                   0.1.2-1    Fast YAML 1.1 parser and emitter l
ii  python                        2.5.2-3    An interactive high-level object-o
ii  python-central                0.6.8      register and build utility for Pyt

python-yaml recommends no packages.

python-yaml suggests no packages.

-- no debconf information