syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":".struct_span_err(self.def_span(impl_did),"}]}
source_snippet:                     .struct_span_err(self.def_span(impl_did), "multiple async drop impls found")
context_before:                 self.dcx()
context_after:                     .with_span_note(self.def_span(old_impl_did), "other impl here")