Module snafu::guide::feature_flags

Optional extensions to the crate

In addition to the feature flags controlling compatibility, there are Cargo feature flags that extend SNAFU for various use cases.

backtraces

default: enabled

When enabled, you can use the Backtrace type in your enum variant. If you never use backtraces, you can omit this feature to speed up compilation a small amount.

backtrace-crate

default: disabled

When enabled, you can convert the SNAFU Backtrace type to the underlying backtrace::Backtrace type. This allows interoperability with other crates that require this type.

It is recommended that only applications make use of this feature. At some point in the future, the standard library will have its own backtrace type that SNAFU will use and this feature may conflict with its use.

unstable-futures

default: disabled

When enabled, you can use the futures::TryFutureExt and futures::TryStreamExt traits to add context methods to futures and streams returning Results.

Note that this feature requires nightly Rust and may break at any time. When the standard library implementation stabilizes, this feature flag will be renamed and stabilized.

futures-01

default: disabled

When enabled, you can use the futures01::FutureExt and futures01::StreamExt traits to add context methods to futures and streams.