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Manual: document tryEval

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Linus Heckemann 2017-04-17 10:33:53 +01:00
parent f8a2e8a552
commit 9622d00afa
1 changed files with 13 additions and 0 deletions
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doc/manual/expressions/builtins.xml
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@ -1163,6 +1163,19 @@ stdenv.mkDerivation (rec {
</varlistentry>
<varlistentry><term><function>builtins.tryEval</function>
<replaceable>e</replaceable></term>
<listitem><para>Try to evaluate <replaceable>e</replaceable>.
Return a set containing the attributes <literal>success</literal>
(<literal>true</literal> if <replaceable>e</replaceable> evaluated
successfully, <literal>false</literal> if an error was thrown) and
<literal>value</literal>, equalling <replaceable>e</replaceable>
if successful and <literal>false</literal> otherwise.
</para></listitem>
</varlistentry>
<varlistentry><term><function>builtins.typeOf</function>
<replaceable>e</replaceable></term>