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-rw-r--r--tvix/eval/Cargo.toml5
1 files changed, 4 insertions, 1 deletions
diff --git a/tvix/eval/Cargo.toml b/tvix/eval/Cargo.toml
index bf34159656aa..b23fc057ad5a 100644
--- a/tvix/eval/Cargo.toml
+++ b/tvix/eval/Cargo.toml
@@ -39,7 +39,7 @@ itertools = "0.10.3"
 tempdir = "0.3.7"
 
 [features]
-default = [ "repl", "arbitrary" ]
+default = [ "repl", "impure", "arbitrary" ]
 
 # Enables running the Nix language test suite from the original C++
 # Nix implementation (at version 2.3) against Tvix.
@@ -48,6 +48,9 @@ nix_tests = []
 # Enables building the binary (tvix-eval REPL)
 repl = [ "dep:rustyline", "dep:clap" ]
 
+# Enables operations in the VM which depend on the ability to perform I/O
+impure = []
+
 # Enables Arbitrary impls for internal types (required to run tests)
 arbitrary = [ "proptest", "test-strategy" ]