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-rw-r--r--examples/periodic.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/examples/periodic.rs b/examples/periodic.rs
index 875d5b89..61fe1406 100644
--- a/examples/periodic.rs
+++ b/examples/periodic.rs
@@ -33,6 +33,7 @@
#![deny(unsafe_code)]
#![deny(warnings)]
#![feature(proc_macro)]
+#![feature(proc_macro_gen)]
#![no_main]
#![no_std]