From 0e89f55982bea0597b52eee75071caf0e686a449 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Sun, 1 May 2016 22:12:48 +0200
Subject: [PATCH] E0269: add suggestion to check for trailing semicolons

In situations where the value of the last expression must be inferred,
rustc will not emit the "you might need to remove the semicolon" warning,
so at least note this in the extended description.

Fixes: #30497
---
 src/librustc/diagnostics.rs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/librustc/diagnostics.rs b/src/librustc/diagnostics.rs
index e230836ef45..448cdc71af7 100644
--- a/src/librustc/diagnostics.rs
+++ b/src/librustc/diagnostics.rs
@@ -635,7 +635,17 @@ fn foo(x: u8) -> u8 {
 ```
 
 It is advisable to find out what the unhandled cases are and check for them,
-returning an appropriate value or panicking if necessary.
+returning an appropriate value or panicking if necessary. Check if you need
+to remove a semicolon from the last expression, like in this case:
+
+```ignore
+fn foo(x: u8) -> u8 {
+    inner(2*x + 1);
+}
+```
+
+The semicolon discards the return value of `inner`, instead of returning
+it from `foo`.
 "##,
 
 E0270: r##"