syntax_data: {"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":".then(Tree::def(Def::NoSafetyInvariants));"}]}
source_snippet:                 .then(Tree::def(Def::NoSafetyInvariants));
context_before:                 .then(Tree::byte(0x00))
context_after:             assert_eq!(layout.prune(&|d| matches!(d, Def::HasSafetyInvariants)), Tree::byte(0x00));