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LDC-Q4005 — The predicate is applied to the wrong number of arguments

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# LDC-Q4005 — The predicate is applied to the wrong number of arguments

## What it means

A declared predicate takes a fixed number of arguments, and every use
must supply exactly that many: fewer leaves a participant unnamed, more
adds one the declaration never defined. When the count differs, the engine
stops and reports both numbers — how many the declaration takes and how
many the question gave.

Adjust the argument list to the declared count. The predicate name and
the surrounding question stay as written.

## Example

```lawql
query q over "demo.diagnostics" { for x: Applicant; where resident(x); select resident(x, x); }
```

## Fix

```lawql
from r in rules select r
```

## Engine message

The engine reports this in its own wording:

```text
LDC-Q4005: resident: expected 1 args, got 2.
```

## Related

- [Questions to the engine](/constructs/queries/) — the shape of a question over a package.
- [LDC-Q4004](/diagnostics/LDC-Q4004/) — when the predicate itself is unknown.