Remove useless extra_check feature

Author: mlafeldt

crates/duckdb/Cargo.toml

@@ -34,7 +34,6 @@ modern-full = ["chrono", "serde_json", "url", "r2d2", "uuid", "polars"]
 polars = ["dep:polars", "dep:polars-arrow"]
 # FIXME: These were added to make clippy happy: these features appear unused and should perhaps be removed
 column_decltype = []
-extra_check = []
 # Warning: experimental feature
 loadable-extension = ["libduckdb-sys/loadable-extension"]
 

crates/duckdb/src/pragma.rs

@@ -359,12 +359,6 @@ mod test {
     #[ignore]
     fn test_locking_mode() -> Result<()> {
         let db = Connection::open_in_memory()?;
-        let r = db.pragma_update(None, "locking_mode", &"exclusive");
-        if cfg!(feature = "extra_check") {
-            r.unwrap_err();
-        } else {
-            r?;
-        }
-        Ok(())
+        db.pragma_update(None, "locking_mode", &"exclusive")
     }
 }