Merge pull request #1139 from ahoppen/ahoppen/fix-56

Fix build of SwiftSyntax using Swift 5.6

Author: ahoppen

Tests/SwiftParserTest/Assertions.swift

@@ -337,7 +337,7 @@ func AssertParse<S: SyntaxProtocol>(
 ) {
   AssertParse(
     markedSource,
-    { source in
+    { (source: String) -> S in
       var parser = Parser(source)
       return parse(&parser)
     },

Tests/SwiftParserTest/Parser+EntryTests.swift

@@ -20,7 +20,7 @@ public class EntryTests: XCTestCase {
   }
 
   func testTopLevelBufferParse() throws {
-    AssertParse("func test() {}", { source in
+    AssertParse("func test() {}", { (source: String) -> SourceFileSyntax in
       var source = source
       source.makeContiguousUTF8()
       return source.withUTF8 { Parser.parse(source: $0) }