contains.swift

/// Returns a Boolean value indicating whether the given element is contained
/// within the range.
///
/// A `ClosedRange` instance contains both its lower and upper bound.
/// `element` is contained in the range if it is between the two bounds or
/// equal to either bound.
///
/// - Parameter element: The element to check for containment.
/// - Returns: `true` if `element` is contained in the range; otherwise,
///   `false`.
public func contains(_ element: Bound) -> Bool