Parse error once and not twice if there's more than one available

[mauro-oto]

If a Ruby stacktrace includes two syntax errors, like below:

➜  dead_end git:(main) ✗ ruby dog.rb
dog.rb:5: syntax error, unexpected `end', expecting ']'
    end
dog.rb:10: syntax error, unexpected end-of-input, expecting `end'

We should parse only the first time we encounter errors, and not the second
time. If we know the type of error and unmatched symbol, we shouldn't need to
check those again.

[mauro-oto]

On hold for a bit until we figure out how to work with multiple syntax errors: https://bugs.ruby-lang.org/issues/17621

[schneems]

Sounds good. Thanks!

[schneems]

thanks!