syntax_data: {"ast_node_type":"variable","tokens":[{"end":31,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let mut impls = Vec::new();
context_before: pub(super) fn incoherent_impls_provider(tcx: TyCtxt<'_>, simp: SimplifiedType) -> &[DefId] {
context_after:     for cnum in iter::once(LOCAL_CRATE).chain(tcx.crates(()).iter().copied()) {