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Merge pull request #1337 from lheckemann/doc-tryEval

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Manual: document tryEval
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Eelco Dolstra 2017-04-18 16:54:37 +02:00 committed by GitHub
parent 67fe3e07b2 9622d00afa
commit 62a07992bd
1 changed files with 13 additions and 0 deletions
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13
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>