Make doc tests compilable

src/lib.rs

@@ -12,6 +12,21 @@
 //!   the `std::error::Error` trait.
 //!
 //!   ```
+//!   # pub trait Deserialize {}
+//!   #
+//!   # mod serde_json {
+//!   #     use super::Deserialize;
+//!   #     use std::io;
+//!   #
+//!   #     pub fn from_str<T: Deserialize>(json: &str) -> io::Result<T> {
+//!   #         unimplemented!()
+//!   #     }
+//!   # }
+//!   #
+//!   # struct ClusterMap;
+//!   #
+//!   # impl Deserialize for ClusterMap {}
+//!   #
 //!   use anyhow::Result;
 //!
 //!   fn get_cluster_info() -> Result<ClusterMap> {
@@ -19,6 +34,8 @@
 //!       let map: ClusterMap = serde_json::from_str(&config)?;
 //!       Ok(map)
 //!   }
+//!   #
+//!   # fn main() {}
 //!   ```
 //!
 //! - Attach context to help the person troubleshooting the error understand
@@ -27,15 +44,36 @@
 //!   level step the application was in the middle of.
 //!
 //!   ```
+//!   # struct It;
+//!   #
+//!   # impl It {
+//!   #     fn detach(&self) -> Result<()> {
+//!   #         unimplemented!()
+//!   #     }
+//!   # }
+//!   #
 //!   use anyhow::{Context, Result};
 //!
 //!   fn main() -> Result<()> {
+//!       # return Ok(());
+//!       #
+//!       # const _: &str = stringify! {
 //!       ...
+//!       # };
+//!       #
+//!       # let it = It;
+//!       # let path = "./path/to/instrs.jsox";
+//!       #
 //!       it.detach().context("failed to detach the important thing")?;
 //!
 //!       let content = std::fs::read(path)
 //!           .with_context(|| format!("failed to read instrs from {}", path))?;
+//!       #
+//!       # const _: &str = stringify! {
 //!       ...
+//!       # };
+//!       #
+//!       # Ok(())
 //!   }
 //!   ```
 //!
@@ -50,12 +88,36 @@
 //!   mutable reference as needed.
 //!
 //!   ```
+//!   # use anyhow::anyhow;
+//!   # use std::fmt::{self, Display};
+//!   # use std::task::Poll;
+//!   #
+//!   # #[derive(Debug)]
+//!   # enum DataStoreError {
+//!   #     Censored(()),
+//!   # }
+//!   #
+//!   # impl Display for DataStoreError {
+//!   #     fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+//!   #         unimplemented!()
+//!   #     }
+//!   # }
+//!   #
+//!   # impl std::error::Error for DataStoreError {}
+//!   #
+//!   # const REDACTED_CONTENT: () = ();
+//!   #
+//!   # let error = anyhow!("...");
+//!   # let root_cause = &error;
+//!   #
+//!   # let ret =
 //!   // If the error was caused by redaction, then return a
 //!   // tombstone instead of the content.
 //!   match root_cause.downcast_ref::<DataStoreError>() {
-//!       Some(DataStoreError::Censored(_)) => Ok(Async::Ready(REDACTED_CONTENT)),
-//!       None => Err(e),
+//!       Some(DataStoreError::Censored(_)) => Ok(Poll::Ready(REDACTED_CONTENT)),
+//!       None => Err(error),
 //!   }
+//!   # ;
 //!   ```
 //!
 //! - A backtrace is captured and printed with the error if the underlying error