Rspec返回语法错误“意外的'{'，期望keyword_end”

Question

这可以在使用Ruby的一台机器上使用，但不能在另一台机器上使用。

码：

describe 'testing reverse string different ways' do

  let :thing {'cba321'}

  it 'the system method' do
    source = '123abc'
    result = source.reverse
    expect(result).to eq 'cba321'
  end 
end

错误：

SyntaxError:                                                                                                             
  /home/michael/Dropbox/90_2019/work/code/ruby__rails/ruby/reverse_string_tests_timing/test_spec.rb:12: syntax error, une
xpected '{', expecting keyword_end                                                                                       
    let :thing {'cba321'}                                                                                                
               ^                                                                                                         
  /home/michael/Dropbox/90_2019/work/code/ruby__rails/ruby/reverse_string_tests_timing/test_spec.rb:12: syntax error, une
xpected '}', expecting end-of-input                                                                                      
    let :thing {'cba321'}  

Answer 1

In Ruby 2.4.1 not having parens in the let was allowed but in Ruby 2.5.1 it is not.

So the fix is to add parens to the let, e.g.

change

let :source {'cba321'}

to

let (:source) {'cba321'}