[Pkg-erlang-devel] Bug#703778: erlang-base-hipe: re named subpatterns spuriously not matched

[Chris King]

Package: erlang-base-hipe
Version: 1:15.b.1-dfsg-4
Severity: normal


Named subpatterns incorrectly return empty matches if they occur not in
alphabetical order.

Correct behavior (bar matches 2nd branch):

1> re:run("bar", "^(?<a>foo)(?<b>bla)$|^(?<a>[[:word:]]+)$",
          [dupnames, {capture, [a, b], list}]).
{match,["bar",[]]}

Incorrect behavior (bar matches 2nd branch but does not return a match):

2> re:run("bar", "^(?<b>foo)(?<a>bla)$|^(?<b>[[:word:]]+)$",
          [dupnames, {capture, [b, a], list}]).
{match,[[],[]]}

Note the only difference is the names given to the subpatterns.  The order
of the capture list ([a, b]) does not make a difference.


-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.7.3 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages erlang-base-hipe depends on:
ii  libc6                    2.13-37         Embedded GNU C Library: Shared lib
ii  libncurses5              5.9-10          shared libraries for terminal hand
ii  libtinfo5                5.9-10          shared low-level terminfo library 
ii  procps                   1:3.2.7-11      /proc file system utilities
ii  zlib1g                   1:1.2.7.dfsg-13 compression library - runtime

Versions of packages erlang-base-hipe recommends:
ii  erlang-crypto            1:15.b.1-dfsg-4 Erlang/OTP cryptographic modules
ii  erlang-syntax-tools      1:15.b.1-dfsg-4 Erlang/OTP modules for handling ab
pn  libsctp1                 <none>          (no description available)

Versions of packages erlang-base-hipe suggests:
ii  erlang                   1:15.b.1-dfsg-4 Concurrent, real-time, distributed
ii  erlang-doc               1:15.b.1-dfsg-4 Erlang/OTP HTML/PDF documentation
ii  erlang-edoc              1:15.b.1-dfsg-4 Erlang/OTP module for generating d
ii  erlang-gs                1:15.b.1-dfsg-4 Erlang/OTP graphics system
pn  erlang-manpages          <none>          (no description available)
ii  erlang-tools             1:15.b.1-dfsg-4 Erlang/OTP various tools

-- no debconf information