Further simply backtrace conditional compilation

Author: dtolnay

src/backtrace.rs

@@ -1,13 +1,13 @@
 #[cfg(feature = "std")]
-pub(crate) use std::backtrace::{Backtrace, BacktraceStatus};
+pub(crate) use std::backtrace::Backtrace;
 
 #[cfg(not(feature = "std"))]
 pub(crate) enum Backtrace {}
 
 #[cfg(feature = "std")]
 macro_rules! backtrace {
     () => {
-        Some(crate::backtrace::Backtrace::capture())
+        Some(std::backtrace::Backtrace::capture())
     };
 }
 

src/error.rs

@@ -411,7 +411,7 @@ impl Error {
     /// anyhow = { version = "1.0", features = ["backtrace"] }
     /// ```
     #[cfg(feature = "std")]
-    pub fn backtrace(&self) -> &std::backtrace::Backtrace {
+    pub fn backtrace(&self) -> &Backtrace {
         unsafe { ErrorImpl::backtrace(self.inner.by_ref()) }
     }
 

src/fmt.rs

@@ -42,8 +42,8 @@ impl ErrorImpl {
 
         #[cfg(feature = "std")]
         {
-            use crate::backtrace::BacktraceStatus;
             use alloc::string::ToString;
+            use std::backtrace::BacktraceStatus;
 
             let backtrace = unsafe { Self::backtrace(this) };
             if let BacktraceStatus::Captured = backtrace.status() {