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-rw-r--r--compiler/rustc_session/src/options.rs4
1 files changed, 2 insertions, 2 deletions
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index 8274fd05bc0..0b0b67ef890 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -1919,8 +1919,8 @@ written to standard error output)"),
     #[rustc_lint_opt_deny_field_access("use `Session::lto` instead of this field")]
     thinlto: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "enable ThinLTO when possible"),
-    thir_unsafeck: bool = (false, parse_bool, [TRACKED],
-        "use the THIR unsafety checker (default: no)"),
+    thir_unsafeck: bool = (true, parse_bool, [TRACKED],
+        "use the THIR unsafety checker (default: yes)"),
     /// We default to 1 here since we want to behave like
     /// a sequential compiler for now. This'll likely be adjusted
     /// in the future. Note that -Zthreads=0 is the way to get