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In #225 it was reported that the output looks incorrect:
```
$ cat /tmp/4a71c7e417cc9eac0971e3a2519b295c/scratch.rb
def x.y.z
end
$ ruby /tmp/4a71c7e417cc9eac0971e3a2519b295c/scratch.rb
/tmp/4a71c7e417cc9eac0971e3a2519b295c/scratch.rb: --> /tmp/4a71c7e417cc9eac0971e3a2519b295c/scratch.rb
expected a delimiter to close the parametersunexpected '.', ignoring it
> 1 def x.y.z
> 2 end
```
Specifically:
```
expected a delimiter to close the parametersunexpected '.', ignoring it
```
However this does not show up when executing the debug executable:
```
$ bin/bundle exec exe/syntax_suggest /tmp/4a71c7e417cc9eac0971e3a2519b295c/scratch.rb
--> /tmp/4a71c7e417cc9eac0971e3a2519b295c/scratch.rb
expected a delimiter to close the parameters
unexpected '.', ignoring it
> 1 def x.y.z
> 2 end
```
This is because `exe/syntax_suggest` uses STDOUT.puts while calling `ruby` with the filename uses a fake IO object represented by MiniStringIO. This class was incorrectly not adding a newline to the end of the print.
The fix was to move the class to it's own file where it can be tested and then fix the behavior.
close https://github.com/ruby/syntax_suggest/pull/225
https://github.com/ruby/syntax_suggest/commit/d2ecd94a3b
Co-authored-by: Andy Yong <[email protected]>
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