syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                 if self.typeck_results.is_method_call(expr) {
context_before:             hir::ExprKind::Call(fun, ref args) => {
context_after:                     // The callee is something implementing Fn, FnMut, or FnOnce.