syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":".then(Tree::def(Def::HasSafetyInvariants));"}]}
source_snippet:                 .then(Tree::def(Def::HasSafetyInvariants));
context_before:                 .then(Tree::byte(0x00))
context_after:             assert_eq!(