Wait, there's more! > When passing a closure with a single underscore argument ({ _ in ...}) to a > function expecting multiple arguments, the compiler may error after migration > with: > > error: cannot convert value of type '(_) -> ()' to expected argument > type > (32301091) > Workaround: To fix the error, change the single argument to the correct > number of arguments > > such as { (_,_) in ...} > > > > When passing a closure to map with two function arguments, the compiler may > after migration error with: > > error: 'map' produces '[T]', not the expected contextual result type > '<TYPE>' > (32432752) > Workaround: Change the closure signature to accept a tuple argument of two > elements when > > using map. >
Gwendal > Le 6 juin 2017 à 06:36, Gwendal Roué <gwendal.r...@gmail.com> a écrit : > > http://adcdownload.apple.com/WWDC_2017/Xcode_9_beta/Xcode_9_beta_Release_Notes.pdf > > <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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