Merge pull request swiftlang#230 from dabelknap/pound-error

Use a workaround to catch unknownTokenKind("pound_error") errors.

Author: dabelknap

Sources/swift-format/Run.swift

@@ -37,6 +37,13 @@ func lintMain(configuration: Configuration, path: String) -> Int {
     return 1
   }
   catch {
+    // Workaround: we're unable to directly catch unknownTokenKind errors due to access
+    // restrictions. TODO: this can be removed when we update to Swift 5.0.
+    if "\(error)" == "unknownTokenKind(\"pound_error\")" {
+      stderrStream.write("Unable to lint \(path): unknownTokenKind(\"pound_error\")\n")
+      stderrStream.flush()
+      return 1
+    }
     stderrStream.write("Unable to lint \(path): \(error)\n")
     stderrStream.flush()
     exit(1)
@@ -81,6 +88,13 @@ func formatMain(
     return 1
   }
   catch {
+    // Workaround: we're unable to directly catch unknownTokenKind errors due to access
+    // restrictions. TODO: this can be removed when we update to Swift 5.0.
+    if "\(error)" == "unknownTokenKind(\"pound_error\")" {
+      stderrStream.write("Unable to format \(path): unknownTokenKind(\"pound_error\")\n")
+      stderrStream.flush()
+      return 1
+    }
     stderrStream.write("Unable to format \(path): \(error)\n")
     stderrStream.flush()
     exit(1)