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when this feature was added, it was possible to call `write!` more than once from a `Format::format` implementation. that operation corrupted the data stream so a runtime check was added to `write!` to prevent the data corruption by panicking on a double use of `write!` PR #305 makes `write!` consume the `Formatter` value so the above issue is now prevented at compile time. The runtime check is no longer necessary (failure case is unreachable) so we remove it
jonas-schievink
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Dec 16, 2020
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bors r+ |
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when this feature was added, it was possible to call
write!more than once from aFormat::formatimplementation. that operation corrupted the data stream so a runtime check was added to
write!toprevent the data corruption by panicking on a double use of
write!PR #305 makes
write!consume theFormattervalue so the above issue is now prevented at compiletime. The runtime check is no longer necessary (failure case is unreachable) so we remove it