syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"CanonicalVarKind::PlaceholderRegion(placeholder)"}]}
source_snippet:             CanonicalVarKind::PlaceholderRegion(placeholder) => {
context_before:             }
context_after:                 CanonicalVarKind::PlaceholderRegion(placeholder.with_updated_universe(ui))