syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"a_val.valtree()"}]}
source_snippet:             a_val.valtree() == b_val.valtree()
context_before:         (ty::ConstKind::Value(a_val), ty::ConstKind::Value(b_val)) => {
context_after:         }