Running prettier twice on the same file crashes

[AlanFoster]

Input

https://github.com/rails/rails/blob/9099d66bc38f2e560613258f520d46df624d99c0/activesupport/lib/active_support/configurable.rb

Current output

       # Compiles reader methods so we don't have to go through method_missing.
       def self.compile_methods!(keys)
         keys.reject { |m| method_defined?(m) }.each do |key|
-          class_eval <<-RUBY, __FILE__, __LINE__ + 1
-            def #{key}; _get(#{key.inspect}); end
-          RUBY
+          class_eval <<-RUBY
+                                 def #{key}; _get(#{key
+                       .inspect}); end
+          RUBY,
+                     __FILE__,
+                     __LINE__ + 1
         end
       end
     end

Note that this code crashes when running prettier again on the same file:

src/ripper.rb:33:in block in parse': undefined method []' for nil:NilClass (NoMethodError)

Expected output

Not to crash

Reproduction

Run prettier with --write twice on the Rail's file, or once with --debug-check

yarn prettier --debug-check --plugin=. --parser=ruby ../rails/activesupport/lib/active_support/configurable.rb

[kddnewton]

Yeah, this is the same as #50 - we've gotta address heredoc handling. Gonna close this as a dup of that one