diff options
Diffstat (limited to 'doc/manual')
| -rw-r--r-- | doc/manual/command-ref/env-common.xml | 3 | ||||
| -rw-r--r-- | doc/manual/expressions/language-constructs.xml | 20 |
2 files changed, 21 insertions, 2 deletions
diff --git a/doc/manual/command-ref/env-common.xml b/doc/manual/command-ref/env-common.xml index c532ffdde..6a3aaae71 100644 --- a/doc/manual/command-ref/env-common.xml +++ b/doc/manual/command-ref/env-common.xml @@ -14,7 +14,8 @@ <varlistentry><term><envar>IN_NIX_SHELL</envar></term> <listitem><para>Indicator that tells if the current environment was set up by - <command>nix-shell</command>.</para></listitem> + <command>nix-shell</command>. Since Nix 2.0 the values are + <literal>"pure"</literal> and <literal>"impure"</literal></para></listitem> </varlistentry> diff --git a/doc/manual/expressions/language-constructs.xml b/doc/manual/expressions/language-constructs.xml index f961ed921..923b5d8c4 100644 --- a/doc/manual/expressions/language-constructs.xml +++ b/doc/manual/expressions/language-constructs.xml @@ -217,7 +217,25 @@ but can also be written as: ellipsis(<literal>...</literal>) as you can access attribute names as <literal>a</literal>, using <literal>args.a</literal>, which was given as an additional attribute to the function. - </para></listitem> + </para> + + <warning> + <para> + The <literal>args@</literal> expression is bound to the argument passed to the function which + means that attributes with defaults that aren't explicitly specified in the function call + won't cause an evaluation error, but won't exist in <literal>args</literal>. + </para> + <para> + For instance +<programlisting> +let + function = args@{ a ? 23, ... }: args; +in + function {} +</programlisting> + will evaluate to an empty attribute set. + </para> + </warning></listitem> </itemizedlist> |