syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:                                 for subobligation in subobligations.iter_mut() {
context_before:                                 // `TraitObligationStackList`.
context_after:                                     subobligation.set_depth_from_parent(obligation.recursion_depth);