syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"CanonicalVarKind::PlaceholderConst(placeholder)"}]}
source_snippet:             CanonicalVarKind::PlaceholderConst(placeholder) => {
context_before:             }
context_after:                 CanonicalVarKind::PlaceholderConst(placeholder.with_updated_universe(ui))