Add path primop.

builtins.path allows specifying the name of a path (which makes paths
with store-illegal names now addable), allows adding paths with flat
instead of recursive hashes, allows specifying a filter (so is a
generalization of filterSource), and allows specifying an expected
hash (enabling safe path adding in pure mode).

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/lang/data b/tests/lang/data
new file mode 100644
index 000000000000..257cc5642cb1
--- /dev/null
+++ b/tests/lang/data
@@ -0,0 +1 @@
+foo