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-rw-r--r--tests/filter-source.nix.in5
1 files changed, 4 insertions, 1 deletions
diff --git a/tests/filter-source.nix.in b/tests/filter-source.nix.in
index 8493835c2b93..6fd494794e0c 100644
--- a/tests/filter-source.nix.in
+++ b/tests/filter-source.nix.in
@@ -4,6 +4,9 @@ derivation {
   builder = "@shell@";
   args = ["-e" "-x" (builtins.toFile "builder" "PATH=@testPath@; ln -s $input $out")];
   input =
-    let filter = path: type: type != "symlink" && baseNameOf (toString path) != "foo";
+    let filter = path: type:
+      type != "symlink"
+      && baseNameOf path != "foo"
+      && !((import ./lang/lib.nix).hasSuffix ".bak" (baseNameOf path));
     in builtins.filterSource filter ./test-tmp/filterin;
 }