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authorEelco Dolstra <e.dolstra@tudelft.nl>2008-08-14T14·00+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2008-08-14T14·00+0000
commit9279174dde3e1a450e63e866d2683352dd8238d3 (patch)
tree05b5b835f143b97d150a37873641fb5d5e9a7075 /tests/lang/eval-okay-xml.exp.xml
parentdb4f4a842515392a6b40f5c86b2ef885c1278451 (diff)
* 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).

Diffstat (limited to 'tests/lang/eval-okay-xml.exp.xml')
-rw-r--r--tests/lang/eval-okay-xml.exp.xml10
1 files changed, 10 insertions, 0 deletions
diff --git a/tests/lang/eval-okay-xml.exp.xml b/tests/lang/eval-okay-xml.exp.xml
index 4f55c69a7cad..72a96d54c7d3 100644
--- a/tests/lang/eval-okay-xml.exp.xml
+++ b/tests/lang/eval-okay-xml.exp.xml
@@ -22,6 +22,16 @@
     <attr name="c">
       <string value="foobar" />
     </attr>
+    <attr name="ellipsis">
+      <function>
+        <attrspat>
+          <attr name="x" />
+          <attr name="y" />
+          <attr name="z" />
+          <ellipsis />
+        </attrspat>
+      </function>
+    </attr>
     <attr name="f">
       <function>
         <attrspat>