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In Ruby 2.7, an explicit Hash (with curly braces) as the last argument is implicitly converted to kwargs.

In Ruby 3.0+, an explicit Hash (with curly braces) as the last argument is treated as a Hash literal, and can't be parsed as kwargs.

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import Foundation
import UIKit

class ConstraintTransaction {
  private var constraints: [Constraint] = []

  func add(_ constraint: Constraint) {
    constraints.append(constraint)
  }

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import UIKit

class ConstraintDSL {
  private let view: UIView
  private var chain: [NSLayoutConstraint] = []

  init(_ view: UIView) {
    self.view = view
  }

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// Define Provider Protocols
protocol NetworkProvider {
  var networkingService: NetworkServiceProtocol
}

protocol LoggingProvider {
  var loggerService: LoggerServiceProtocol
}

protocol ConfigurationProvider {

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const Promise = require('bluebird');
const fs = require('fs');
const LineByLine = require('n-readlines');
const { promisify } = require('util');
const exec = promisify(require('child_process').exec);

const filesWithoutExtension = [
  'Podfile',
  'Mintfile',
].reduce((acc, f) => { acc[f.toLowerCase()] = true; return acc; }, {}); // Convert to Set with lowercased filenames.

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extension JSONValue {

  public var value: JSONPrimitive? {
    switch self {
    case .object(let value): return value
    case .array(let value): return value
    case .string(let value): return value
    case .number(let value): return value
    case .boolean(let value): return value
    case .null: return nil

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extension JSONValue: Decodable {

  public init(from decoder: Decoder) throws {
    let container = try decoder.singleValueContainer()
    if let value = try? container.decode(Bool.self) {
      self = .boolean(value)
    } else if let value = try? container.decode(Double.self) {
      // Double covers Int as well
      self = .number(value)
    } else if let value = try? container.decode(String.self) {

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public enum JSONValue {

  case object([String: JSONValue])
  case array([JSONValue])
  case string(String)
  case number(Double)
  case boolean(Bool)
  case null

}

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public enum JSONValue {

  case object([String: JSONValue])
  case array([JSONValue])
  case string(String)
  case number(Double)
  case boolean(Bool)
  case null

  public var value: JSONPrimitive? {

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import XCTest

fileprivate extension JSONValue {
  var objectValue: [String: JSONValue]? {
    switch self {
    case .object(let value): return value
    default: return nil
    }
  }
  var arrayValue: [JSONValue]? {