This following code fails to compile (which is correct, as far as I can judge
that):
if let x = 5 { }
// error: initializer for conditional binding must have Optional type, not
'Int'
But why is does it compile (with a warning) if an explicit type annotation is
added?
if let y: Int = 5 { }
// warning: non-optional expression of type 'Int' used in a check for
optionals
Tested with Xcode 8.3.2 and both the build-in Swift 3.1 toolchain and the Swift
4.0 snapshot from May 25, 2017.
I am just curious and would like to understand if there is fundamental
difference between those statements.
Regards, Martin
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