[swift-evolution] Revisiting SE-0110

[Gwendal Roué]

http://adcdownload.apple.com/WWDC_2017/Xcode_9_beta/Xcode_9_beta_Release_Notes.pdf

> The migrator does not properly distinquish between single-tuple and multiple-argument function types as described in SE–0110, causing additional mismatched type errors with the closure types that are passed to Standard Library functions expecting tuple objects. (32431899)
> 
> Workaround: Manually fix the closure types to accept values of tuples instead of separate argument values.
> 
> 
> 
> When using $0 and $1 in a closure that is passed to a function expecting a closure with a single tuple argument, the compiler may error after migration with:
> 
>     error: closure tuple parameter '(TYPE, TYPE)' does not support
>     destructuring with implicit parameters
> (32489893)
> 
> Workaround: Change $0 and $1 references to $0.0 and $0.1 respectively. 
> 
Where are the firemen?

Gwendal

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