shellcheck fix: tests/functional/placeholders.sh

maintainers/flake-module.nix

@@ -106,7 +106,6 @@
             enable = true;
             excludes = [
               # We haven't linted these files yet
-              ''^tests/functional/placeholders\.sh$''
               ''^tests/functional/post-hook\.sh$''
               ''^tests/functional/pure-eval\.sh$''
               ''^tests/functional/push-to-store-old\.sh$''

tests/functional/placeholders.sh

@@ -4,6 +4,7 @@ source common.sh
 
 clearStoreIfPossible
 
+# shellcheck disable=SC2016
 nix-build --no-out-link -E '
   with import '"${config_nix}"';