Install new pub/priv/export rules as defaults, old rules accessible under #[legacy_exports];

src/libstd/unicode.rs

@@ -2,6 +2,7 @@
 #[forbid(deprecated_pattern)];
 
 mod icu {
+    #[legacy_exports];
     type UBool = u8;
     type UProperty = int;
     type UChar32 = char;
@@ -151,6 +152,7 @@ mod icu {
     #[link_name = "icuuc"]
     #[abi = "cdecl"]
     extern mod libicu {
+        #[legacy_exports];
         pure fn u_hasBinaryProperty(c: UChar32, which: UProperty) -> UBool;
         pure fn u_isdigit(c: UChar32) -> UBool;
         pure fn u_islower(c: UChar32) -> UBool;
@@ -209,6 +211,7 @@ pure fn is_upper(c: char) -> bool {
 
 #[cfg(test)]
 mod tests {
+    #[legacy_exports];
 
     #[test]
     fn test_is_digit() {