syntax_data: {"ast_node_type":"impl","tokens":[{"end":73,"kind":"keyword","start":0,"text":"remainder:"}]}
source_snippet:     remainder: &mut impl Iterator<Item = &'c [SubpatternBindings<'tcx>]>,
context_before:     candidate_bindings: &'c [SubpatternBindings<'tcx>],
context_after: ) {