Document and tidy up alias-uninit-value.rs

Author: jieyouxu

tests/ui/alias-uninit-value.rs

@@ -1,19 +1,27 @@
+//! Regression test for issue #374, where previously rustc performed conditional jumps or moves that
+//! incorrectly depended on uninitialized values.
+//!
+//! Issue: <https://github.com/rust-lang/rust/issues/374>.
+
 //@ run-pass
 
 #![allow(non_camel_case_types)]
 #![allow(dead_code)]
 
+enum sty {
+    ty_nil,
+}
 
-
-// Regression test for issue #374
-
-
-enum sty { ty_nil, }
-
-struct RawT {struct_: sty, cname: Option<String>, hash: usize}
+struct RawT {
+    struct_: sty,
+    cname: Option<String>,
+    hash: usize,
+}
 
 fn mk_raw_ty(st: sty, cname: Option<String>) -> RawT {
-    return RawT {struct_: st, cname: cname, hash: 0};
+    return RawT { struct_: st, cname: cname, hash: 0 };
 }
 
-pub fn main() { mk_raw_ty(sty::ty_nil, None::<String>); }
+pub fn main() {
+    mk_raw_ty(sty::ty_nil, None::<String>);
+}