syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // using a coercion (or is a no-op).
context_before:         // Check to see if this cast is a "coercion cast", where the cast is actually done
context_after:         if self.typeck_results.is_coercion_cast(source.hir_id) {