syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"Tree::byte(0x00).then(Tree::def(Def::NoSafetyInvariants)).then(Tree::byte(0x01));"}]}
source_snippet:                 Tree::byte(0x00).then(Tree::def(Def::NoSafetyInvariants)).then(Tree::byte(0x01));
context_before:             let layout: Tree<Def, !, !> =