syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // The `deduced_param_attrs` list could be empty if this is a type of function
context_before:             if let &mut PassMode::Indirect { ref mut attrs, .. } = &mut arg.mode {
context_after:                 // we can't deduce any parameters for, so make sure the argument index is in