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<chapter xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="ssec-relnotes-1.6.1">
<title>Release 1.6.1 (October 28, 2013)</title>
<para>This is primarily a bug fix release. Changes of interest
are:</para>
<itemizedlist>
<listitem>
<para>Nix 1.6 accidentally changed the semantics of antiquoted
paths in strings, such as <literal>"${/foo}/bar"</literal>. This
release reverts to the Nix 1.5.3 behaviour.</para>
</listitem>
<listitem>
<para>Previously, Nix optimised expressions such as
<literal>"${<replaceable>expr</replaceable>}"</literal> to
<replaceable>expr</replaceable>. Thus it neither checked whether
<replaceable>expr</replaceable> could be coerced to a string, nor
applied such coercions. This meant that
<literal>"${123}"</literal> evaluatued to <literal>123</literal>,
and <literal>"${./foo}"</literal> evaluated to
<literal>./foo</literal> (even though
<literal>"${./foo} "</literal> evaluates to
<literal>"/nix/store/<replaceable>hash</replaceable>-foo "</literal>).
Nix now checks the type of antiquoted expressions and
applies coercions.</para>
</listitem>
<listitem>
<para>Nix now shows the exact position of undefined variables. In
particular, undefined variable errors in a <literal>with</literal>
previously didn't show <emphasis>any</emphasis> position
information, so this makes it a lot easier to fix such
errors.</para>
</listitem>
<listitem>
<para>Undefined variables are now treated consistently.
Previously, the <function>tryEval</function> function would catch
undefined variables inside a <literal>with</literal> but not
outside. Now <function>tryEval</function> never catches undefined
variables.</para>
</listitem>
<listitem>
<para>Bash completion in <command>nix-shell</command> now works
correctly.</para>
</listitem>
<listitem>
<para>Stack traces are less verbose: they no longer show calls to
builtin functions and only show a single line for each derivation
on the call stack.</para>
</listitem>
<listitem>
<para>New built-in function: <function>builtins.typeOf</function>,
which returns the type of its argument as a string.</para>
</listitem>
</itemizedlist>
</chapter>
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