Bump namespace to 04
diff --git a/syntax/symbol.rs b/syntax/symbol.rs
index 066d238..c8500b9 100644
--- a/syntax/symbol.rs
+++ b/syntax/symbol.rs
@@ -4,7 +4,7 @@
 use std::fmt::{self, Display, Write};
 
 // A mangled symbol consisting of segments separated by '$'.
-// For example: cxxbridge03$string$new
+// For example: cxxbridge04$string$new
 pub struct Symbol(String);
 
 impl Display for Symbol {