* Sync with the trunk.

tests/lang.sh

@@ -50,7 +50,8 @@ for i in lang/eval-okay-*.nix; do
     fi
     
     if test -e lang/$i.exp.xml; then
-        if ! $nixinstantiate --eval-only --xml --strict lang/$i.nix > lang/$i.out.xml; then
+        if ! $nixinstantiate --eval-only --xml --no-location --strict \
+                lang/$i.nix > lang/$i.out.xml; then
             echo "FAIL: $i should evaluate"
             fail=1
         elif ! cmp -s lang/$i.out.xml lang/$i.exp.xml; then

tests/lang/eval-okay-toxml.exp

@@ -0,0 +1 @@
+"<?xml version='1.0' encoding='utf-8'?>\n<expr>\n  <attrs>\n    <attr name=\"a\">\n      <string value=\"s\" />\n    </attr>\n  </attrs>\n</expr>\n"

tests/lang/eval-okay-toxml.nix

@@ -0,0 +1,3 @@
+# Make sure the expected XML output is produced; in particular, make sure it
+# doesn't contain source location information.
+builtins.toXML { a = "s"; }