guide: use "C" in extern items

rust-lang · Sep 18, 2017 · e1588d5 · e1588d5
1 parent 6c702c4
commit e1588d5
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diff --git a/guide/items.md b/guide/items.md
@@ -110,3 +110,10 @@ Use `{}` for the full definition of the macro.
 macro_rules! foo {
 }
 ```
+
+
+### extern items
+
+When writing extern items (such as `extern "C" fn`), always be explicit about
+the ABI. For example, write `extern "C" fn foo ...`, not `extern fn foo ...`, or
+`extern "C" { ... }.