Hello,
I'm writing to complain about SE-0031 and Swift 2 compatibility. I understand
(and agree with!) the change, but the migration between now and 2017 is
annoying, hence my complaint.
In snapshot swift-DEVELOPMENT-SNAPSHOT-2016-04-12-a, we started erroring on the
old syntax. That means that this:
func foo(inout bar: Int) { }
is not legal Swift 3.
...however, the new syntax:
func foo(bar: inout Int) { }
is not legal Swift 2. This complicates compiling for both, which several of my
projects currently do.
/Further complicating matters/, Swift does not understand line-scoped ifdefs.
So this:
#if swift(>=3.0)
func foo(bar: inout Int) {
#else
func foo(inout bar: Int) {
#endif
//my
//long
//functon
//definition
}
Is not legal Swift. The only way I know of is to say:
#if swift(>=3.0)
func foo(bar: inout Int) {
//my
//long
//functon
//definition
}
#else
func foo(inout bar: Int) {
//my
//long
//functon
//definition
}
#endif
which forces duplication of the entire function definition.
My suggestion would be one or more of the following:
1. Support both syntaxes in Swift 3 "trunk" (e.g. until Swift 3 is released).
2. Backport the new syntax to Swift 2.2
3. Consider allowing line-scoped ifdefs
Thanks for reading, and sorry to rain on a parade I largely think is Good For
Swift ™
Drew_______________________________________________
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