diff --git a/ci-test.sh b/ci-test.sh
index ad79dfa..873ccbd 100644
--- a/ci-test.sh
+++ b/ci-test.sh
@@ -1,6 +1,9 @@
 #!/bin/bash
 set -euo pipefail
 
+rustc gamma.rs && ./gamma
+exit 1
+
 DEFAULTFLAGS="-Zrandomize-layout -Zmiri-strict-provenance"
 
 # make sure we keep using the current toolchain even in subdirs that have a toolchain file
diff --git a/gamma.rs b/gamma.rs
new file mode 100644
index 0000000..34a65f9
--- /dev/null
+++ b/gamma.rs
@@ -0,0 +1,5 @@
+#![feature(float_gamma)]
+
+fn main() {
+  dbg!(std::hint::black_box(-0.5f32).gamma());
+}