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-rw-r--r--src/libsyntax/diagnostic_list.rs12
1 files changed, 12 insertions, 0 deletions
diff --git a/src/libsyntax/diagnostic_list.rs b/src/libsyntax/diagnostic_list.rs
index 8534969c623..20be7f8361a 100644
--- a/src/libsyntax/diagnostic_list.rs
+++ b/src/libsyntax/diagnostic_list.rs
@@ -374,6 +374,18 @@ and likely to change in the future.
 
 "##,
 
+E0635: r##"
+The `#![feature]` attribute specified an unknown feature.
+
+Erroneous code example:
+
+```compile_fail,E0635
+#![feature(nonexistent_rust_feature)] // error: unknown feature
+```
+
+"##,
+
+
 }
 
 register_diagnostics! {