guard

问题 Back in November of 2016 I posted a question asking why I couldn't use guard to create an unwrapped version of a variable using the same name as the optional, like you can with if let: Link: Why isn't guard let foo = foo valid? When I wrote that question, the code below would fail to compile with an error that "Definition conflicts with previous value": //Test of using guard to create an unwrapped version of a var, like if let func guardTest(_ viewController: UIViewController?) ->

问题 When launching Guard, I\'m getting this output: $ guard WARN: Unresolved specs during Gem::Specification.reset: lumberjack (>= 1.0.2) ffi (>= 0.5.0) WARN: Clearing out unresolved specs. Please report a bug if this causes problems. What does this mean, and how do I fix it? Contents of Guardfile: guard \'livereload\' do watch(%r{.+\\.(css|js|html)$}) end guard \'sass\', :input => \'css\', :style => :compressed, :extension => \'.min.css\' 回答1: I was seeing this issue by just running RSpec on its