Updates for SE-0089

Author: CodaFi

Sources/Basic/StringConversions.swift

@@ -54,7 +54,7 @@ public extension String {
         }
 
         // Otherwise iterate and escape all the single quotes.
-        var newString = "'" + String(utf8[utf8.startIndex..<singleQuotePos])
+        var newString = "'" + String(utf8[utf8.startIndex..<singleQuotePos])!
 
         for char in utf8[singleQuotePos..<utf8.endIndex] {
             if char == UInt8(ascii: "'") {

Sources/Basic/TOML.swift

@@ -268,7 +268,7 @@ private struct Lexer {
                     break
                 }
             }
-            return .stringLiteral(value: String(utf8[utf8.index(after: startIndex)..<endIndex]))
+            return .stringLiteral(value: String(utf8[utf8.index(after: startIndex)..<endIndex])!)
 
         // Numeric literals.
         //
@@ -279,7 +279,7 @@ private struct Lexer {
             while let c = look(), c.isNumberChar() {
                 let _ = eat()
             }
-            return .number(value: String(utf8[startIndex..<index]))
+            return .number(value: String(utf8[startIndex..<index])!)
 
         // Identifiers.
         case let c where c.isIdentifierChar():
@@ -289,7 +289,7 @@ private struct Lexer {
             }
 
             // Match special strings.
-            let value: String = String(utf8[startIndex..<index])
+            let value: String = String(utf8[startIndex..<index])!
             switch value {
             case "true":
                 return .boolean(value: true)
@@ -761,5 +761,5 @@ public extension TOMLItem {
 /// returns: A list of the lexed tokens' string representations.
 internal func lexTOML(_ data: String) -> [String] {
     let lexer = Lexer(data)
-    return lexer.map { String($0) }
+    return lexer.map { String(describing: $0) }
 }

Tests/PackageLoadingTests/ConventionTests.swift

@@ -835,7 +835,7 @@ final class PackageBuilderTester {
             // FIXME: Find a better way. Maybe Package can keep array of warnings.
             uncheckedDiagnostics = Set(warningStream.bytes.asReadableString.characters.split(separator: "\n").map(String.init))
         } catch {
-            let errorStr = String(error)
+            let errorStr = String(describing: error)
             result = .error(errorStr)
             uncheckedDiagnostics.insert(errorStr)
         }