Merge pull request #359 from shepmaster/std-backtrace-no-crate

Do not require the backtrace crate when using backtraces-impl-std

Cargo.toml

@@ -46,7 +46,7 @@ backtraces-impl-backtrace-crate = ["backtraces"]
 unstable-backtraces-impl-std = ["backtraces-impl-std", "snafu-derive/unstable-backtraces-impl-std"]
 
 # The backtrace type becomes `std::backtrace::Backtrace`
-backtraces-impl-std = ["backtraces"]
+backtraces-impl-std = []
 
 # The std::error::Error provider API will be implemented.
 unstable-provider-api = ["snafu-derive/unstable-provider-api"]

src/guide/feature_flags.md

@@ -111,12 +111,6 @@ this feature will no longer be supported and will be removed.
 <dl class="snafu-ff-meta">
 <dt>Default</dt>
 <dd>disabled</dd>
-<dt>Implies</dt>
-<dd>
-
-[`backtraces`](#backtraces)
-
-</dd>
 </dl>
 
 When enabled, the SNAFU [`Backtrace`] type becomes an alias to the