Allow dashes in identifiers

In Nixpkgs, the attribute in all-packages.nix corresponding to a
package is usually equal to the package name.  However, this doesn't
work if the package contains a dash, which is fairly common.  The
convention is to replace the dash with an underscore (e.g. "dbus-lib"
becomes "dbus_glib"), but that's annoying.  So now dashes are valid in
variable / attribute names, allowing you to write:

  dbus-glib = callPackage ../development/libraries/dbus-glib { };

and

  buildInputs = [ dbus-glib ];

Since we don't have a negation or subtraction operation in Nix, this
is unambiguous.

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/lang/eval-okay-attrs5.nix b/tests/lang/eval-okay-attrs5.nix
index e77ee7a1c22b..0a98b8fdffa6 100644
--- a/tests/lang/eval-okay-attrs5.nix
+++ b/tests/lang/eval-okay-attrs5.nix
@@ -4,7 +4,7 @@ let
 
   as = { x.y.z = 123; a.b.c = 456; };
 
-  bs = { foo.bar = "foo"; };
+  bs = { f-o-o.bar = "foo"; };
 
   or = x: y: x || y;
   
@@ -13,7 +13,7 @@ in
     as.foo or "foo"
     as.x.y.bla or as.a.b.c
     as.a.b.c or as.x.y.z
-    as.x.y.bla or bs.foo.bar or "xyzzy"
+    as.x.y.bla or bs.f-o-o.bar or "xyzzy"
     as.x.y.bla or bs.bar.foo or "xyzzy"
     123.bla or null.foo or "xyzzy"
     # Backwards compatibility test.