[jameskilton]

I'm amazed it took this long but these changes are very VERY welcome:

G++ now issues clearer diagnostics for missing semicolons after class, struct, and union definitions.

G++ now issues clearer diagnostics for missing semicolons after class member declarations.

G++ now issues clearer diagnostics when a colon is used in a place where a double-colon was intended.

[Someone]

I guess that partly is because they got competition that showed such things are possible at all (http://clang.llvm.org/diagnostics.html).

C++ is notoriously hard to parse, and even harder to produce useful error messages for.