Rename `into_u16` to `as_u16`

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/src/html.rs b/docs/src/html.rs
index 5363d1b2..78a43511 100644
--- a/docs/src/html.rs
+++ b/docs/src/html.rs
@@ -478,7 +478,7 @@ impl World for DocWorld {
     }
 
     fn source(&self, id: SourceId) -> &Source {
-        assert_eq!(id.into_u16(), 0, "invalid source id");
+        assert_eq!(id.as_u16(), 0, "invalid source id");
         &self.0
     }