diff --git a/Cargo.toml b/Cargo.toml
index 73eec29..60235cb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,4 +9,4 @@ edition = "2021"
 thiserror = "1.0"
 structopt = "0.3"
 regex = "1.5"
-gc = { version = "0.4", features = ["derive"] }
\ No newline at end of file
+gc = { version = "0.4", features = ["derive", "nightly"] }
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 64b52c0..349e569 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,4 @@
+#![feature(unsize, coerce_unsized)]
 mod compile;
 mod obj;
 mod scope;