[Issue 5096] More readable unpaired brace error

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=5096

--- Comment #2 from Adam D. Ruppe <destructionator at gmail.com> ---
This struck me AGAIN last week. I copy/pasted some code to shuffle things into
a nested function and brought in an extra }. The first error message issued was
*hundreds of lines* past the actual error, then the remaining ones even further
out.

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