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authorEelco Dolstra <e.dolstra@tudelft.nl>2006-08-23T14·39+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2006-08-23T14·39+0000
commit4a053bfdfd85915a2a659a337bd171bc22c49138 (patch)
tree0f4f9a835d7262fac1a473b515aecf30e4a74236 /tests/lang/eval-okay-builtins.nix
parent68515b5a96d0d7c114570434f605e5077b7d3166 (diff)
* A new primop `builtins', which returns an attribute set containing
  all the primops.  This allows Nix expressions to test for new
  primops and take appropriate action if they're not available.  For
  instance, rather than calling a primop `foo' directly, they could
  say `if builtins ? foo then builtins.foo ... else ...'.

Diffstat (limited to 'tests/lang/eval-okay-builtins.nix')
-rw-r--r--tests/lang/eval-okay-builtins.nix12
1 files changed, 12 insertions, 0 deletions
diff --git a/tests/lang/eval-okay-builtins.nix b/tests/lang/eval-okay-builtins.nix
new file mode 100644
index 000000000000..e9d65e88a817
--- /dev/null
+++ b/tests/lang/eval-okay-builtins.nix
@@ -0,0 +1,12 @@
+assert builtins ? currentSystem;
+assert !builtins ? __currentSystem;
+
+let {
+
+  x = if builtins ? dirOf then builtins.dirOf /foo/bar else "";
+
+  y = if builtins ? fnord then builtins.fnord "foo" else "";
+
+  body = x + y;
+  
+}