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[Format] Add format check for throwing negative numbers

Authored by jonathoma on Oct 17 2019, 2:40 PM.



The code throw -1; is currently formatted by clang-format as
throw - 1;. This diff adds a fix for this edge case and a test to check
for this in the future.

For context, I am looking into a related bug in the clang-formatting of
coroutine keywords: co_yield -1; is also reformatted in this manner
as co_yield - 1;. A later diff will add these changes and tests for the
co_yield and co_return keywords.

Diff Detail