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-rw-r--r--tests/functional/lang/eval-okay-substring-context.exp1
-rw-r--r--tests/functional/lang/eval-okay-substring-context.nix11
2 files changed, 12 insertions, 0 deletions
diff --git a/tests/functional/lang/eval-okay-substring-context.exp b/tests/functional/lang/eval-okay-substring-context.exp
new file mode 100644
index 000000000..2fe7f71fa
--- /dev/null
+++ b/tests/functional/lang/eval-okay-substring-context.exp
@@ -0,0 +1 @@
+"okay"
diff --git a/tests/functional/lang/eval-okay-substring-context.nix b/tests/functional/lang/eval-okay-substring-context.nix
new file mode 100644
index 000000000..d0ef70d4e
--- /dev/null
+++ b/tests/functional/lang/eval-okay-substring-context.nix
@@ -0,0 +1,11 @@
+with builtins;
+
+let
+
+ s = "${builtins.derivation { name = "test"; builder = "/bin/sh"; system = "x86_64-linux"; }}";
+
+in
+
+if getContext s == getContext "${substring 0 0 s + unsafeDiscardStringContext s}"
+then "okay"
+else throw "empty substring should preserve context"