From 2a5a6b42ecf99b198eae89e13053b00bd1582a27 Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume1.gomez@gmail.com>
Date: Tue, 15 Sep 2020 18:18:04 +0200
Subject: [PATCH] Add missing code examples in libcore

---
 library/core/src/num/dec2flt/mod.rs | 10 ++++++++++
 library/core/src/num/mod.rs         | 20 ++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/library/core/src/num/dec2flt/mod.rs b/library/core/src/num/dec2flt/mod.rs
index ed6202bb82f..6f3a3a86745 100644
--- a/library/core/src/num/dec2flt/mod.rs
+++ b/library/core/src/num/dec2flt/mod.rs
@@ -166,6 +166,16 @@ fn from_str(src: &str) -> Result<Self, ParseFloatError> {
 ///
 /// This error is used as the error type for the [`FromStr`] implementation
 /// for [`f32`] and [`f64`].
+///
+/// # Example
+///
+/// ```
+/// use std::str::FromStr;
+///
+/// if let Err(e) = f64::from_str("a.12") {
+///     println!("Failed conversion to f64: {}", e);
+/// }
+/// ```
 #[derive(Debug, Clone, PartialEq, Eq)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct ParseFloatError {
diff --git a/library/core/src/num/mod.rs b/library/core/src/num/mod.rs
index 2a936c1867d..050c187e555 100644
--- a/library/core/src/num/mod.rs
+++ b/library/core/src/num/mod.rs
@@ -5286,6 +5286,14 @@ fn from_str_radix<T: FromStrRadixHelper>(src: &str, radix: u32) -> Result<T, Par
 ///
 /// [`str.trim()`]: ../../std/primitive.str.html#method.trim
 /// [`i8::from_str_radix`]: ../../std/primitive.i8.html#method.from_str_radix
+///
+/// # Example
+///
+/// ```
+/// if let Err(e) = i32::from_str_radix("a12", 10) {
+///     println!("Failed conversion to i32: {}", e);
+/// }
+/// ```
 #[derive(Debug, Clone, PartialEq, Eq)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct ParseIntError {
@@ -5293,6 +5301,18 @@ pub struct ParseIntError {
 }
 
 /// Enum to store the various types of errors that can cause parsing an integer to fail.
+///
+/// # Example
+///
+/// ```
+/// #![feature(int_error_matching)]
+///
+/// # fn main() {
+/// if let Err(e) = i32::from_str_radix("a12", 10) {
+///     println!("Failed conversion to i32: {:?}", e.kind());
+/// }
+/// # }
+/// ```
 #[unstable(
     feature = "int_error_matching",
     reason = "it can be useful to match errors when making error messages \
-- 
2.44.0