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-rw-r--r--tests/functional/repl_characterization/data/idempotent.test13
-rw-r--r--tests/functional/repl_characterization/repl_characterization.cc1
2 files changed, 14 insertions, 0 deletions
diff --git a/tests/functional/repl_characterization/data/idempotent.test b/tests/functional/repl_characterization/data/idempotent.test
new file mode 100644
index 000000000..4ab087d45
--- /dev/null
+++ b/tests/functional/repl_characterization/data/idempotent.test
@@ -0,0 +1,13 @@
+A previously unforced thunk in an attribute set does not lead to indentation when it won't evaluate to a nested structure:
+ nix-repl> :p let x = 1 + 2; in [ { inherit x; } { inherit x; } ]
+ [
+ { x = 3; }
+ { x = 3; }
+ ]
+
+Same for a list:
+ nix-repl> :p let x = 1 + 2; in [ [ x ] [ x ] ]
+ [
+ [ 3 ]
+ [ 3 ]
+ ]
diff --git a/tests/functional/repl_characterization/repl_characterization.cc b/tests/functional/repl_characterization/repl_characterization.cc
index c91d6c1e3..f2cf0ca3d 100644
--- a/tests/functional/repl_characterization/repl_characterization.cc
+++ b/tests/functional/repl_characterization/repl_characterization.cc
@@ -185,5 +185,6 @@ REPL_TEST(repl_overlays_error);
REPL_TEST(repl_printing);
REPL_TEST(stack_vars);
REPL_TEST(errors);
+REPL_TEST(idempotent);
}; // namespace nix