How can I use region-based isolation?

Using Swift
4

The language does not allow all variable declarations, though:

// OK
nonisolated(unsafe) let ns = ...

// Compiler error
if nonisolated(unsafe) let ns = ... { }

// Compiler error
guard nonisolated(unsafe) let ns = ... else { }

One can deal with if let without coming up with a new variable name, though:

// OK
if let ns = ... {
  nonisolated(unsafe) let ns = ns
}

But this won't work with guard:

// Compiler error
guard let ns = ... else { }
nonisolated(unsafe) let ns = ns
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