syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"(&ty::Adt(a_def,"}]}
source_snippet:                 (&ty::Adt(a_def, a_args), &ty::Adt(b_def, b_args))
context_before:             match (a.kind(), b.kind()) {
context_after:                     if a_def == b_def && a_def.is_struct() =>