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-rw-r--r--askama_derive/src/generator.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/askama_derive/src/generator.rs b/askama_derive/src/generator.rs
index b00094d..75e4a2d 100644
--- a/askama_derive/src/generator.rs
+++ b/askama_derive/src/generator.rs
@@ -589,5 +589,6 @@ impl<'a, T: 'a> SetChain<'a, T> where T: cmp::Eq + hash::Hash {
}
fn pop(&mut self) {
self.scopes.pop().unwrap();
+ assert!(self.scopes.len() > 0);
}
}