error[E0599]: no method named `shift_insert` found for struct `IndexMap` in the current scope
--> /Users/USER/.cargo/registry/src/index.crates.io-6f17d22bba15001f/serde_json-1.0.119/src/map.rs:140:18
|
140 | self.map.shift_insert(index, k, v)
| ^^^^^^^^^^^^