# Function Call Expression

A function call expression applies a function value to arguments.

```dcdl
increment(41)
```

## Evaluation

An argument is evaluated when the function body references it.
If the argument is referenced several times, its evaluation result is reused.
When a parameter has a range, the argument is refined using the same rules as `narrower as wider`.
Fields present only in the parameter range remain abstract, and defaults are not selected at this point.