Incorrect span for multiline format string with errors

[estebank]

Given a multiline format string with an unclosed brace, the inner span to the format string is shifted 1 character to the right for each newline.

Introduced in #52649.

[johnfercher]

I would like to help with this issue. May someone give me some information about how I can help?

[estebank]

@johnfercher I believe one of the uses of seen_newlines should be there, which causes the span to be shifter by one for each newline, possibly this one.

You should modify this file to include the incorrect case in the description, and use ./x.py test src/test/ui --bless to update the corresponding stderr file. You can use git diff to see if the change you made is actually doing what you expect it to do.