add test for ? desugaring

Author: Centri3

tests/ui/allow_attributes_without_reason.rs

@@ -28,3 +28,17 @@ fn main() {
         fn b() {}
     }
 }
+
+// Make sure this is not triggered on `?` desugaring
+
+pub fn trigger_fp_option() -> Option<()>{
+    Some(())?;
+    None?;
+    Some(())
+}
+
+pub fn trigger_fp_result() -> Result<(), &'static str> {
+    Ok(())?;
+    Err("asdf")?;
+    Ok(())
+}