syntax_data: {"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if let Some(value) = project(elem, &value) {
context_before:             let elem = self.places[child].proj_elem.unwrap();
context_after:                 self.for_each_projection_value(child, value, project, f);