Extract trivial extern type alias detection to module
diff --git a/syntax/mod.rs b/syntax/mod.rs
index 31c88c9..4cedc28 100644
--- a/syntax/mod.rs
+++ b/syntax/mod.rs
@@ -22,6 +22,7 @@
 pub mod symbol;
 mod tokens;
 mod toposort;
+pub mod trivial;
 pub mod types;
 
 use self::discriminant::Discriminant;