syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:             for binding in by_value_bindings.clone() {
context_before:             // place they refer to can't be modified by the guard.
context_after:                 let local_id = self.var_local_id(binding.var_id, RefWithinGuard);