syntax_data: {"ast_node_type":"function","tokens":[{"end":56,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn is_constructor(self, def_id: DefId) -> bool {
context_before:     /// a tuple struct like `struct Foo(u32)`, and `false` otherwise.
context_after:         matches!(self.def_kind(def_id), DefKind::Ctor(..))