syntax_data: {"ast_node_type":"other","tokens":[{"end":25,"kind":"keyword","start":0,"text":"impl<'tcx>"}]}
source_snippet: impl<'tcx> TyCtxt<'tcx> {
context_before: // Needs to be associated with the `'tcx` lifetime
context_after:     pub const COMMON_VTABLE_ENTRIES: &'tcx [VtblEntry<'tcx>] =