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3b36879203
Detect missing fields with default values and suggest `..`
When a struct ctor use has missing fields, if all those missing fields have defaults, suggest `..`:
```
error[E0063]: missing fields `field1` and `field2` in initializer of `S`
--> $DIR/non-exhaustive-ctor.rs:16:13
|
LL | let _ = S { field: () };
| ^ missing `field1` and `field2`
|
help: all remaining fields have default values, you can use those values with `..`
|
LL | let _ = S { field: (), .. };
| ++++
```