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). --- src/libexpr/lexer.l | 1 + 1 file changed, 1 insertion(+) (limited to 'src/libexpr/lexer.l') diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l index b7c1d19f8a5c..81aec99e15c8 100644 --- a/src/libexpr/lexer.l +++ b/src/libexpr/lexer.l @@ -95,6 +95,7 @@ let { return LET; } in { return IN; } rec { return REC; } inherit { return INHERIT; } +\.\.\. { return ELLIPSIS; } \=\= { return EQ; } \!\= { return NEQ; } -- cgit 1.4.1