# Summary
Add support for the first unary operator: negating integer literals. The
resulting type is another integer literal, with the value being the
negated value of the literal. All other types continue to return
`Type::Unknown` for the present, but this is designed to make it easy to
extend easily with other combinations of operator and operand.
Contributes to #12701.
## Test Plan
Add tests with basic negation, including of very large integers and
double negation.
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