{"ast_node_type":"function","tokens":[{"end":85,"kind":"keyword","start":0,"text":"do_check(\"fn"}]}
        do_check("fn main() { |x: i32|$0 x * 2;}", "fn main() { $0|x: i32| x * 2;}");
        do_check("struct Foo { a: i32, }$0", "struct Foo $0{ a: i32, }");
        do_check("fn main() { $0|x: i32| x * 2;}", "fn main() { |x: i32$0| x * 2;}");