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Nix 1.6.1 release notes
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<title>Nix Release Notes</title>
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<!--==================================================================-->
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<section xml:id="ssec-relnotes-1.6.1"><title>Release 1.6.1 (TBA)</title>
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<para>This is primarily a bug fix release. Changes of interest
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are:</para>
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<itemizedlist>
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<listitem>
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<para>Nix 1.6 accidentally changed the semantics of antiquoted
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paths in strings, such as <literal>"${/foo}/bar"</literal>. This
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release reverts to the Nix 1.5.3 behaviour.</para>
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</listitem>
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<listitem>
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<para>Previously, Nix optimised expressions such as
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<literal>"${<replaceable>expr</replaceable>}"</literal> to
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<replaceable>expr</replaceable>. Thus it neither checked whether
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<replaceable>expr</replaceable> could be coerced to a string, nor
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applied such coercions. This meant that
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<literal>"${123}"</literal> evaluatued to <literal>123</literal>,
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and <literal>"${./foo}"</literal> evaluated to
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<literal>./foo</literal> (even though
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<literal>"${./foo} "</literal> evaluates to
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<literal>"/nix/store/<replaceable>hash</replaceable>-foo "</literal>).
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Nix now checks the type of antiquoted expressions and
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applies coercions.</para>
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</listitem>
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<listitem>
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<para>Nix now shows the exact position of undefined variables. In
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particular, undefined variable errors in a <literal>with</literal>
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previously didn't show <emphasis>any</emphasis> position
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information, so this makes it a lot easier to fix such
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errors.</para>
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</listitem>
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<listitem>
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<para>Undefined variables are now treated consistently.
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Previously, the <function>tryEval</function> function would catch
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undefined variables inside a <literal>with</literal> but not
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outside. Now <function>tryEval</function> never catches undefined
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variables.</para>
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</listitem>
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<listitem>
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<para>Bash completion in <command>nix-shell</command> now works
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correctly.</para>
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</listitem>
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<listitem>
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<para>In order to be less verbose, stack traces no longer show
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calls to builtin functions.</para>
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</listitem>
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</itemizedlist>
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</section>
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<!--==================================================================-->
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