{"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":"P(ast::FnDecl"}]}
        P(ast::FnDecl { inputs, output })
    pub fn fn_decl(&self, inputs: ThinVec<ast::Param>, output: ast::FnRetTy) -> P<ast::FnDecl> {
    }