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diff --git a/test/testdata/eval-fail-bad-string-interpolation-4.nix b/test/testdata/eval-fail-bad-string-interpolation-4.nix
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+++ b/test/testdata/eval-fail-bad-string-interpolation-4.nix
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+let
+  # Basically a "billion laughs" attack, but toned down to simulated `pkgs`.
+  ha = x: y: { a = x y; b = x y; c = x y; d = x y; e = x y; f = x y; g = x y; h = x y; j = x y; };
+  has = ha (ha (ha (ha (x: x)))) "ha";
+  # A large structure that has already been evaluated.
+  pkgs = builtins.deepSeq has has;
+in
+# The error message should not be too long.
+''${pkgs}''