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Add helpful hint in io docs about how ? is not allowed in main() #40763

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Merged
merged 5 commits into from
Apr 1, 2017
Merged

Add helpful hint in io docs about how ? is not allowed in main() #40763

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4dc1225
Add helpful hint on io function for beginners
pirate Mar 23, 2017
53d5082
requested changes
pirate Mar 23, 2017
04fbec1
newline for breathing room
pirate Mar 23, 2017
4806f01
Fix tidy errors and simplify example
pirate Mar 27, 2017
cd2ec7e
add missing import
pirate Mar 28, 2017
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12 changes: 12 additions & 0 deletions src/libstd/io/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -145,6 +145,18 @@
//! # }
//! ```
//!
//! Note that you cannot use the `?` operator in functions that do not return
//! a `Result<T, E>` (e.g. `main`). Instead, you can call `.unwrap()` or `match`
//! on the return value to catch any possible errors:
//!
//! ```
//! use std::io;
//!
//! let mut input = String::new();
//!
//! io::stdin().read_line(&mut input).unwrap();
//! ```
//!
//! And a very common source of output is standard output:
//!
//! ```
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