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David Farler bf52ff032a [Migrator] Conservative and Minimal @objc inference workflows

Based on recommendations in SE-0160, there are two migration workflows:

- Conservative: Maintain @objc visibility that was inferred in Swift 3
  by adding @objc to all declarations that were implicitily visible to
  the Objective-C runtime. This is invoked in the migrator by adding the
  -migrate-keep-objc-visibility flag.
- Minimal: Only declarations that must be visible to Objective-C based
  on their uses (or in cases like dynamic vars) are migrated.

rdar://problem/31876357

2017-04-28 18:28:34 -07:00

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 // RUN: %swiftc_driver -update-code -migrate-keep-objc-visibility -### %s 2>&1 | %FileCheck -check-prefix=CHECK-KEEP-OBJC %s
 // CHECK-KEEP-OBJC: -migrate-keep-objc-visibility
 // CHECK-KEEP-OBJC: -emit-remap-file-path {{.*}}.remap