diff --git a/src/syntax/ast.rs b/src/syntax/ast.rs
index 50f0122..33803a7 100644
--- a/src/syntax/ast.rs
+++ b/src/syntax/ast.rs
@@ -35,7 +35,7 @@ impl<'a> Display for Expr<'a> {
     }
 }
 
-pub(crate) fn write_seq(
+fn write_seq(
     f: &mut impl Write,
     iterable: impl IntoIterator<Item = impl Display>,
     delimiter_left: &str,