syntax_data: {"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if let Some(impl_item_span) = ty_to_impl_span(proj.self_ty()) {
context_before:             // span for both obligations that it is lowered to.
context_after:                 cause.span = impl_item_span;