IDE0080Unnecessary code rules (expression-level preferences)

Remove unnecessary suppression operator

Description

This rule flags an unnecessary suppression or null-forgiving operator. The operator is unnecessary when it's used in a context where it has no effect. Use of the suppression operator, for example, x!, declares that the expression x of a reference type isn't null. However, when used in a context of another operator, for example, the is operator in o !is string, it has no effect and can be removed.

Example

// Code with violations
if (o !is string) { }

// Potential fixes:
// 1.
if (o is not string) { }

// 2.
if (!(o is string)) { }

// 3.
if (o is string) { }

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