rollup merge of rust-lang#16721 : tshepang/convenience

Author: alexcrichton

src/doc/guide.md

@@ -2670,10 +2670,10 @@ $ cargo new modules --bin
 
 Let's double check our work by compiling:
 
-```{bash,ignore}
-$ cargo build
+```{bash,notrust}
+$ cargo run
    Compiling modules v0.0.1 (file:///home/you/projects/modules)
-$ ./target/modules
+     Running `target/modules`
 Hello, world!
 ```