Module snafu::guide::feature_flags

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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:

std

default: enabled

When enabled, SNAFU will implement the std::error::Error trait. When disabled, SNAFU will instead implement a custom Error trait that is similar, but does not need any features from the standard library.

See also unstable-core-error.

Most usages of SNAFU will want this feature enabled.

unstable-core-error

default: disabled

When enabled, SNAFU will implement the core::error::Error trait, even when the std feature flag is also enabled.

guide

default: disabled

When enabled, the guide module containing the user’s guide will be built.

Most usages of SNAFU will want this feature disabled.

backtraces

default: disabled

When enabled, the Backtrace type in your enum variant will capture a backtrace when the error is generated. If you never use backtraces, you can omit this feature to speed up compilation a small amount.

It is recommended that only applications make use of this feature.

backtraces-impl-backtrace-crate

default: disabled

When enabled, the SNAFU Backtrace type becomes an alias to the backtrace::Backtrace type. This allows interoperability with other crates that require this type.

It is recommended that only applications make use of this feature. When the standard library stabilizes its own backtrace type, this feature will no longer be supported and will be removed.

unstable-backtraces-impl-std

default: disabled

When enabled, the SNAFU Backtrace type becomes an alias to the std::backtrace::Backtrace type and std::error::Error::backtrace is implemented.

It is recommended that only applications make use of this feature.

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.