# `Reach.Evidence.NilParameter`
[🔗](https://github.com/elixir-vibe/reach/blob/v2.8.4/lib/reach/evidence/nil_parameter.ex#L1)

Collects nil-capable parameter uses and their dominating non-nil guards.

# `collect_project`

```elixir
@spec collect_project(Reach.Project.t() | map()) :: [
  Reach.Evidence.NilParameter.Fact.t()
]
```

Collects nilability and guard-dominance facts for project functions.

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*Consult [api-reference.md](api-reference.md) for complete listing*