markdown writer: incorrect results when link text equals URL (1.11.1, regression)

[eisenstatdavid]

$ echo '<a href="x">x</a>' | pandoc -f html -t markdown
<x>
$ echo '[x](x)' | pandoc -f markdown -t markdown
<x>
$ echo '<x>' | pandoc -f markdown -t html
<p><x></p>
$ echo '[x](y)' | pandoc -f markdown -t markdown
[x](y)
$ pandoc --version
pandoc 1.11.1
Compiled with citeproc-hs 0.3.8, texmath 0.6.1.3, highlighting-kate 0.5.3.8.
Syntax highlighting is supported for the following languages:
    actionscript, ada, apache, asn1, asp, awk, bash, bibtex, boo, c, changelog,
    clojure, cmake, coffee, coldfusion, commonlisp, cpp, cs, css, curry, d,
    diff, djangotemplate, doxygen, doxygenlua, dtd, eiffel, email, erlang,
    fortran, fsharp, gnuassembler, go, haskell, haxe, html, ini, java, javadoc,
    javascript, json, jsp, julia, latex, lex, literatecurry, literatehaskell,
    lua, makefile, mandoc, matlab, maxima, metafont, mips, modula2, modula3,
    monobasic, nasm, noweb, objectivec, objectivecpp, ocaml, octave, pascal,
    perl, php, pike, postscript, prolog, python, r, relaxngcompact, rhtml, ruby,
    rust, scala, scheme, sci, sed, sgml, sql, sqlmysql, sqlpostgresql, tcl,
    texinfo, verilog, vhdl, xml, xorg, xslt, xul, yacc, yaml
Default user data directory: /Users/david/.pandoc
Copyright (C) 2006-2013 John MacFarlane
Web:  http://johnmacfarlane.net/pandoc
This is free software; see the source for copying conditions.  There is no
warranty, not even for merchantability or fitness for a particular purpose.

[jgm]

This is a bug indeed. Pandoc should use an autolink only when the link is an absolute URL.

[jgm]

Note: output for rst is also wrong.