Add 'third_party/nix/' from commit 'be66c7a6b24e3c3c6157fd37b86c7203d14acf10'

git-subtree-dir: third_party/nix
git-subtree-mainline: cf8cd640c1
git-subtree-split: be66c7a6b24e3c3c6157fd37b86c7203d14acf10

third_party/nix/tests/misc.sh

@@ -0,0 +1,19 @@
+source common.sh
+
+# Tests miscellaneous commands.
+
+# Do all commands have help?
+#nix-env --help | grep -q install
+#nix-store --help | grep -q realise
+#nix-instantiate --help | grep -q eval
+#nix-hash --help | grep -q base32
+
+# Can we ask for the version number?
+nix-env --version | grep "$version"
+
+# Usage errors.
+nix-env --foo 2>&1 | grep "no operation"
+nix-env -q --foo 2>&1 | grep "unknown flag"
+
+# Eval Errors.
+nix-instantiate --eval -E 'let a = {} // a; in a.foo' 2>&1 | grep "infinite recursion encountered, at .*(string).*:1:15$"