Merge pull request #62859 from lorentey/mark-utf8-index-encoding

lorentey · web-flow · commit 0bdc84b8de9e · 2023-01-05T13:57:25.000-08:00
[stdlib] String.UTF8View.index(_:offsetBy:limitedBy:): mark encoding of result
diff --git a/stdlib/public/core/StringUTF8View.swift b/stdlib/public/core/StringUTF8View.swift
@@ -191,7 +191,7 @@ extension String.UTF8View: BidirectionalCollection {
       }
       _precondition(result >= 0 && result <= _guts.count,
         "String index is out of bounds")
-      return Index(_encodedOffset: result)
+      return Index(_encodedOffset: result)._knownUTF8
     }
 
     return _foreignIndex(i, offsetBy: n, limitedBy: limit)

Original file line number	Diff line number	Diff line change
`@@ -191,7 +191,7 @@ extension String.UTF8View: BidirectionalCollection {`
`191`	`191`	`}`
`192`	`192`	`_precondition(result >= 0 && result <= _guts.count,`
`193`	`193`	`"String index is out of bounds")`
`194`		`- return Index(_encodedOffset: result)`
	`194`	`+ return Index(_encodedOffset: result)._knownUTF8`
`195`	`195`	`}`
`196`	`196`
`197`	`197`	`return _foreignIndex(i, offsetBy: n, limitedBy: limit)`