Make the grammar tests module a separate module from the grammar module

This way we can run clippy only this module without running
it on the grammar module itself.

Author: damienmg

starlark/src/syntax/grammar.tests.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use super::StarlarkParser;
+use syntax::grammar::StarlarkParser;
 use std::sync::{Arc, Mutex};
 use syntax::ast::Statement;
 use syntax::dialect::Dialect;

starlark/src/syntax/mod.rs

@@ -30,15 +30,16 @@ pub mod lexer;
 #[allow(clippy::all)]
 mod grammar {
     include!(concat!(env!("OUT_DIR"), "/syntax/grammar.rs"));
-    // TODO(damienmg): there doesn't seem to have a way to reactivate default
-    // clippy warning / errors only for the tests...
-    #[cfg(test)]
-    mod tests {
-        include!(concat!(
-            env!("CARGO_MANIFEST_DIR"),
-            "/src/syntax/grammar.tests.rs"
-        ));
-    }
+}
+
+// TODO(damienmg): there doesn't seem to have a way to reactivate default
+// clippy warning / errors only for the tests...
+#[cfg(test)]
+mod grammar_tests {
+    include!(concat!(
+        env!("CARGO_MANIFEST_DIR"),
+        "/src/syntax/grammar.tests.rs"
+    ));
 }
 
 #[doc(hidden)]