Add test for doctest edition support

1 files changed, 1 insertions, 3 deletions

diff --git a/src/doc/unstable-book/src/language-features/try-blocks.md b/src/doc/unstable-book/src/language-features/try-blocks.md
index 866b37a39a7..e342c260a73 100644
--- a/src/doc/unstable-book/src/language-features/try-blocks.md
+++ b/src/doc/unstable-book/src/language-features/try-blocks.md
@@ -9,9 +9,7 @@ The tracking issue for this feature is: [#31436]
 The `try_blocks` feature adds support for `try` blocks. A `try`
 block creates a new scope one can use the `?` operator in.
 
-```rust,ignore
-// This code needs the 2018 edition
-
+```rust,edition2018
 #![feature(try_blocks)]
 
 use std::num::ParseIntError;