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11d38a7e52
When there are no format parameters, it simply calls `writeAll`. This
has the effect of no longer emitting a compile error for using `{}` and
not having any parameters, however, at this point in the development
process of Zig I think that tradeoff is worthwhile.
On the other hand, it might be OK to simply define formatting to work
this way. It's a common pattern to use the formatting function's format
string `"like this", .{}` instead of `"{}", .{"like this"}`, which can
lead to accidentally putting control characters in the formatting
string, however, with this change that works just fine.