[llvm-dev] How does Twine work?

[Russell Wallace via llvm-dev]

I'm looking at the documentation on Twine at
http://llvm.org/docs/ProgrammersManual.html#llvm-adt-twine-h and it gives
example code:

void foo(const Twine &T);
...
StringRef X = ...
unsigned i = ...
foo(X + "." + Twine(i));

How exactly does that last line work? Since addition is left associative, I
would expect it to be parsed as (X + ".") ... so it's trying to add a
StringRef and a const char* before Twine can come into the picture at all?
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