Ensure __fallthrough__ is not considered a valid identifier

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/xixanta/src/node.rs b/lib/xixanta/src/node.rs
index 5093ab3..7a5cf3d 100644
--- a/lib/xixanta/src/node.rs
+++ b/lib/xixanta/src/node.rs
@@ -40,7 +40,10 @@ impl PString {
         }
 
         // You cannot assign into a name which is reserved.
-        if matches!(self.value.to_lowercase().as_str(), "x" | "y" | "a") {
+        if matches!(
+            self.value.to_lowercase().as_str(),
+            "x" | "y" | "a" | "__fallthrough__"
+        ) {
             return Err(format!("cannot use reserved name '{}'", self.value));
         }