syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"CanonicalVarKind::PlaceholderTy(placeholder)"}]}
source_snippet:             CanonicalVarKind::PlaceholderTy(placeholder) => {
context_after:                 CanonicalVarKind::PlaceholderTy(placeholder.with_updated_universe(ui))