[cfe-commits] [PATCH] Improved diagnostics for literal operators

[David Majnemer]

Hi,

This patch implements improved diagnostics for literal operators. I
may have gone a little overboard with the number of different
diagnostics, I can trim it down if it is decided to be excessive. It
also diagnoses when there is an underscore in a string literal with an
ExtWarn as [usrlit.suffix] says that this is reserved for future
standardization.

Determining if a declaration was a literal operator vs a literal
operator template was modified. I make the distinction based off of
the existence or lack of a template-parameter-list instead of the
number of operands.

I decided to only include the suffix in the messages as all literal
operator suffixes all have 'operator ""' which would just add noise to
the output.

Lastly, I only emit a single diagnostic when encountering an error and
bail. I could diagnose more errors in a single go but I don't know how
much more helpful it is.

Comments and suggestions are recommended.

-- 
David Majnemer
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