syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"Ty<'tcx>,"}]}
source_snippet:         Ty<'tcx>, // Target -- `dyn Supertrait` being coerced to.
context_before:         Ty<'tcx>, // Source -- `dyn Subtrait`.
context_after:     ),