Remove some more stale workarounds.

Author: allevato

Sources/SwiftFormatCore/SyntaxLintRule.swift

@@ -28,12 +28,9 @@ extension Rule {
     on node: Syntax?,
     actions: ((inout Diagnostic.Builder) -> Void)? = nil
   ) {
-    // TODO: node?.startLocation should be returning the position ignoring leading trivia. It isn't
-    // working properly, so we are using this workaround until it is fixed.
-    let loc = node.map { $0.startLocation(converter: context.sourceLocationConverter) }
     context.diagnosticEngine?.diagnose(
       message.withRule(self),
-      location: loc,
+      location: node?.startLocation(converter: context.sourceLocationConverter),
       actions: actions
     )
   }

Sources/swift-format/Run.swift

@@ -83,13 +83,6 @@ func formatMain(
     stderrStream.flush()
     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)