syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // If we know there's nothing to do, just return None immediately.
context_before:     pub(crate) fn build_user_type_projections(&self) -> Option<Box<UserTypeProjections>> {
context_after:         if matches!(self, Self::None) {