Merge rayon-rs#657

657: Automatically check if README.md examples are working when running "cargo test" r=cuviper a=GuillaumeGomez

Since rustdoc nightly now provides "cfg(test)" when running on test mode, we can now use this macro on test mode only to check if README.md examples are working as expected.

Co-authored-by: Guillaume Gomez <guillaume1.gomez@gmail.com>
Co-authored-by: Josh Stone <cuviper@gmail.com>

Author: 3 people

Cargo.toml

@@ -34,3 +34,4 @@ rand = "0.6"
 rand_xorshift = "0.1"
 serde = "1"
 serde_derive = "1"
+doc-comment = "0.3"

README.md

@@ -104,14 +104,14 @@ command to get a visualization of an nbody simulation. To see the
 effect of using Rayon, press `s` to run sequentially and `p` to run in
 parallel.
 
-```
+```text
 > cd rayon-demo
 > cargo run --release -- nbody visualize
 ```
 
 For more information on demos, try:
 
-```
+```text
 > cd rayon-demo
 > cargo run --release -- --help
 ```

rayon-core/src/compile_fail/scope_join_bad.rs

@@ -1,4 +1,4 @@
-/*! ```compile_fail,E0597
+/*! ```compile_fail,E0373
 
 fn bad_scope<F>(f: F)
     where F: FnOnce(&i32) + Send,

rayon-futures/src/compile_fail/future_escape.rs

@@ -1,4 +1,4 @@
-/*! ```compile_fail,E0501,E0382,E0597
+/*! ```compile_fail,E0382,E0501,E0503,E0716
 
 extern crate futures;
 extern crate rayon_core;

src/lib.rs

@@ -85,6 +85,12 @@ extern crate rayon_core;
 extern crate rand;
 #[cfg(test)]
 extern crate rand_xorshift;
+#[cfg(test)]
+#[macro_use]
+extern crate doc_comment;
+
+#[cfg(test)]
+doctest!("../README.md");
 
 #[macro_use]
 mod delegate;