From 9279174dde3e1a450e63e866d2683352dd8238d3 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Thu, 14 Aug 2008 14:00:44 +0000 Subject: * Added an experimental feature suggested by Andres: ellipses ("...") in attribute set pattern matches. This allows defining a function that takes *at least* the listed attributes, while ignoring additional attributes. For instance, {stdenv, fetchurl, fuse, ...}: stdenv.mkDerivation { ... }; defines a function that requires an attribute set that contains the specified attributes but ignores others. The main advantage is that we can then write in all-packages.nix aefs = import ../bla/aefs pkgs; instead of aefs = import ../bla/aefs { inherit stdenv fetchurl fuse; }; This saves a lot of typing (not to mention not having to update all-packages.nix with purely mechanical changes). It saves as much typing as the "args: with args;" style, but has the advantage that the function arguments are properly declared (not implicit in what the body of the "with" uses). --- tests/lang/eval-okay-xml.nix | 2 ++ 1 file changed, 2 insertions(+) (limited to 'tests/lang/eval-okay-xml.nix') diff --git a/tests/lang/eval-okay-xml.nix b/tests/lang/eval-okay-xml.nix index 44afbff1ed13..b9389bfae759 100644 --- a/tests/lang/eval-okay-xml.nix +++ b/tests/lang/eval-okay-xml.nix @@ -14,4 +14,6 @@ rec { at = args@{x, y, z}: x; + ellipsis = {x, y, z, ...}: x; + } -- cgit 1.4.1