syntax_data: {"ast_node_type":"function","tokens":[{"end":78,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn new(tcx: TyCtxt<'tcx>, elem: ProjectionElem<Local, Ty<'tcx>>) -> Self {
context_before: impl<'tcx> SelfArgVisitor<'tcx> {
context_after:         Self { tcx, new_base: Place { local: SELF_ARG, projection: tcx.mk_place_elems(&[elem]) } }