failure_derive

• Improved error reporting of the derive feature
• Resolved a potential internal ambiguity when using the backtrace feature that prevented backtrace from improving an upstream API.
• Changed the bounds on std error compat conversions through the From trait to take Sync and Send into account.

• Added Context::map
• Fixed a memory leak for older rust versions on error downcast

The original plan to release 1.0.0 was changed so that version 0.1.1 is released and a related RFC to fix the error trait is submitted. See README for details.

• Fix failure_derive to work with Rust 2018.
• Add #[fail(cause)] that works similarly with #[cause]. The new form is preferred.
• Fix "backtrace" feature to work without "std" feature.
• Add Compat::get_ref.
• Add Fallible.
• Deprecate Fail::causes and <dyn Fail>::causes in favor of newly added <dyn Fail>::iter_causes.
• Deprecate Fail::root_cause and <dyn Fail>::root_cause in favor of newly added <dyn Fail>::find_root_cause.
• Add <dyn Fail>::iter_chain.
• Implement Box<Fail>: Fail.
• Add Error::from_boxed_compat.
• Deprecate Error::cause in favor of newly added Error::as_fail.
• Deprecate Error::causes in favor of newly added Error::iter_chain.
• Deprecate Error::root_cause in favor of newly added Error::find_root_cause.
• Add Error::iter_causes.
• Implement Error: AsRef<Fail>.
• Fix Debug implementation of SyncFailure.

• Add a Causes iterator, which iterates over the causes of a failure. Can be accessed through the Fail::causes or Error::causes methods.
• Add the bail! macro, which "throws" from the function.
• Add the ensure! macro, which is like an "assert" which throws instead of panicking.
• The derive now supports a no_std mode.
• The derive is re-exported from failure by default, so that users do not have to directly depend on failure_derive.
• Add a impl of From<D> for Context<D>, allowing users to ? the D type to produce a Context<D> (for cases where there is no further underlying error).

• Initial version.