# `Mutare.Mutators.BooleanLiteral`
[🔗](https://github.com/foxbenjaminfox/mutare/blob/v0.2.1/lib/mutare/mutators/boolean_literal.ex#L1)

Boolean-literal mutation: `true` ↔ `false`.

Only literals in *runtime* positions are mutated, never pattern literals. A flip that would
reproduce the original value is impossible, so every eligible boolean yields exactly one mutant.

This is the boolean flip that used to be the second arm of the old `literal` family (whose integer
arm is now `Mutare.Mutators.IntegerLiteral`). `true` and `false` are handled here and excluded from
`Mutare.Mutators.AtomLiteral`. Distinct
from `Mutare.Mutators.Conditional`, which forces boolean-valued *operator* expressions (`a > b`,
`a and b`) to a constant — it never fires on a bare literal.

Filterable variants — qualify a `# mutare:ignore` filter with `:label` to suppress the one kind
(`c:Mutare.Mutator.variants/0`): `negate`.

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