Fix error message for -C panic=xxx.

src/librustc/session/config.rs

@@ -802,7 +802,7 @@ macro_rules! options {
         pub const parse_opt_uint: Option<&'static str> =
             Some("a number");
         pub const parse_panic_strategy: Option<&'static str> =
-            Some("either `panic` or `abort`");
+            Some("either `unwind` or `abort`");
         pub const parse_relro_level: Option<&'static str> =
             Some("one of: `full`, `partial`, or `off`");
         pub const parse_sanitizer: Option<&'static str> =

src/test/ui/panic-runtime/bad-panic-flag1.rs

@@ -9,6 +9,6 @@
 // except according to those terms.
 
 // compile-flags:-C panic=foo
-// error-pattern:either `panic` or `abort` was expected
+// error-pattern:either `unwind` or `abort` was expected
 
 fn main() {}

src/test/ui/panic-runtime/bad-panic-flag1.stderr

@@ -1,2 +1,2 @@
-error: incorrect value `foo` for codegen option `panic` - either `panic` or `abort` was expected
+error: incorrect value `foo` for codegen option `panic` - either `unwind` or `abort` was expected
 

src/test/ui/panic-runtime/bad-panic-flag2.rs

@@ -9,6 +9,6 @@
 // except according to those terms.
 
 // compile-flags:-C panic
-// error-pattern:requires either `panic` or `abort`
+// error-pattern:requires either `unwind` or `abort`
 
 fn main() {}

src/test/ui/panic-runtime/bad-panic-flag2.stderr

@@ -1,2 +1,2 @@
-error: codegen option `panic` requires either `panic` or `abort` (C panic=<value>)
+error: codegen option `panic` requires either `unwind` or `abort` (C panic=<value>)