Revert "[SwiftSyntax] Add debug print when the JSONDecoder fails to decode JSON (#14056)" (#14101)

This reverts commit 840166c.

Author: rintaro

test/SwiftSyntax/VisitorTest.swift

@@ -3,6 +3,9 @@
 // REQUIRES: OS=macosx
 // REQUIRES: objc_interop
 
+// FIXME: This test fails occassionally in CI with invalid json.
+// REQUIRES: disabled
+
 import StdlibUnittest
 import Foundation
 import SwiftSyntax
@@ -35,4 +38,4 @@ VisitorTests.test("Basic") {
   })
 }
 
-runAllTests()
+runAllTests()

tools/SwiftSyntax/SwiftSyntax.swift

@@ -25,7 +25,6 @@ import Glibc
 public enum ParserError: Error {
   case swiftcFailed(Int, String)
   case invalidFile
-  case jsonDecodeError(input: String, originalError: Error);
 }
 
 extension Syntax {
@@ -43,16 +42,8 @@ extension Syntax {
     guard result.wasSuccessful else {
       throw ParserError.swiftcFailed(result.exitCode, result.stderr)
     }
-    let jsonData = result.stdoutData
     let decoder = JSONDecoder()
-    let raw: RawSyntax
-    do {
-      raw = try decoder.decode(RawSyntax.self, from: jsonData)
-    } catch let err {
-      throw ParserError.jsonDecodeError(
-          input: String(data: jsonData, encoding: .utf8) ?? jsonData.base64EncodedString(),
-          originalError: err)
-    }
+    let raw = try decoder.decode(RawSyntax.self, from: result.stdoutData)
     guard let file = Syntax.fromRaw(raw) as? SourceFileSyntax else {
       throw ParserError.invalidFile
     }