# `Mutare.Mutator.Mutation.Attribution`
[🔗](https://github.com/foxbenjaminfox/mutare/blob/v0.4.3/lib/mutare/mutator/mutation.ex#L15)

A report-location override for a `Mutare.Mutator.Mutation` (see its `:attribution` field).

Names the clause a whole-node rewrite should be *reported at*, independent of the node spliced
into the metamutant. `original` is the clause before the change (its range locates the site and
renders the diff's "before"). `operation` distinguishes a `:replace`, whose `mutated`
is the replacement AST, from a `:delete`, whose `mutated` is unused (`nil`). No AST
value denotes deletion: `at(original, :drop)` replaces the original with the atom `:drop`.
Build through `Mutare.Mutator.Mutation.at/2` and `Mutare.Mutator.Mutation.at_drop/1`.

Collected mutations also carry the core-resolved `range` and `position`: the source
footprint and, when different, the location used for line selection and suppression
(for example a stage whose replacement spans its whole pipe). Preserve these fields
when relaying a mutation; adapters need not set them.

# `deletion`

```elixir
@type deletion() :: %Mutare.Mutator.Mutation.Attribution{
  mutated: nil,
  operation: :delete,
  original: Macro.t(),
  position: keyword() | nil,
  range: Sourceror.Range.t() | nil
}
```

# `replacement`

```elixir
@type replacement() :: %Mutare.Mutator.Mutation.Attribution{
  mutated: Macro.t(),
  operation: :replace,
  original: Macro.t(),
  position: keyword() | nil,
  range: Sourceror.Range.t() | nil
}
```

# `t`

```elixir
@type t() :: replacement() | deletion()
```

---

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