Merge pull request #21390 from nkcsgexi/rename-index

migrator: rename index(of:) to firstIndex(of:) for swift 5.

Author: nkcsgexi

lib/Migrator/overlay4.json

@@ -1320,5 +1320,16 @@
     "DiffItemKind": "SpecialCaseDiffItem",
     "Usr": "s:5UIKit17UIApplicationMainys5Int32VAD_SpySpys4Int8VGGSgSSSgAJtF",
     "SpecialCaseId": "UIApplicationMain"
-  }
+  },
+  {
+    "DiffItemKind": "CommonDiffItem",
+    "NodeKind": "Function",
+    "NodeAnnotation": "Rename",
+    "ChildIndex": "0",
+    "LeftUsr": "s:SlsSQ7ElementRpzrlE5index2of5IndexQzSgAB_tF",
+    "LeftComment": "index",
+    "RightUsr": "",
+    "RightComment": "firstIndex",
+    "ModuleName": "Swift"
+  },
 ]

test/Migrator/stdlib_rename.swift

@@ -0,0 +1,10 @@
+// REQUIRES: objc_interop
+// RUN: %empty-directory(%t) && %target-swift-frontend -c -update-code -primary-file %s -F %S/mock-sdk -emit-migrated-file-path %t/stdlib_rename.swift.result -emit-remap-file-path %t/stdlib_rename.swift.remap -o /dev/null
+// RUN: diff -u %S/stdlib_rename.swift.expected %t/stdlib_rename.swift.result
+
+func test1(_ a: [String], s: String) {
+  _ = a.index(of: s)
+}
+func test2(_ s: String, c: Character) {
+  _ = s.index(of: c)
+}

test/Migrator/stdlib_rename.swift.expected

@@ -0,0 +1,10 @@
+// REQUIRES: objc_interop
+// RUN: %empty-directory(%t) && %target-swift-frontend -c -update-code -primary-file %s -F %S/mock-sdk -emit-migrated-file-path %t/stdlib_rename.swift.result -emit-remap-file-path %t/stdlib_rename.swift.remap -o /dev/null
+// RUN: diff -u %S/stdlib_rename.swift.expected %t/stdlib_rename.swift.result
+
+func test1(_ a: [String], s: String) {
+  _ = a.firstIndex(of: s)
+}
+func test2(_ s: String, c: Character) {
+  _ = s.firstIndex(of: c)
+}