Clarify mentions of C++ vector in error messages
diff --git a/syntax/check.rs b/syntax/check.rs
index b61570c..0c75de8 100644
--- a/syntax/check.rs
+++ b/syntax/check.rs
@@ -361,7 +361,7 @@
         Type::UniquePtr(_) => "unique_ptr".to_owned(),
         Type::Ref(_) => "reference".to_owned(),
         Type::Str(_) => "&str".to_owned(),
-        Type::CxxVector(_) => "vector".to_owned(),
+        Type::CxxVector(_) => "C++ vector".to_owned(),
         Type::Slice(_) => "slice".to_owned(),
         Type::SliceRefU8(_) => "&[u8]".to_owned(),
         Type::Fn(_) => "function pointer".to_owned(),