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format_args!() inlining/flattening allows for longer lifetimes #110769
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Luckily the fix is easy. We just need to make sure that any
format_args!(…)with arguments still results in an expansion that involves borrowing a temporary.
Before #109999, this gave an error:
But after #109999, that no longer gives an error.
Ideally it shouldn't give an error in any case, but that's a separate issue. Inlining/flattening format_args shouldn't change what compiles and what doesn't compile, so, for now, this still shouldn't compile.