Clean up rustc warnings.

compiletest: compact "linux" "macos" etc.as "unix".
liballoc: remove a superfluous "use".
libcollections: remove invocations of deprecated methods in favor of
    their suggested replacements and use "_" for a loop counter.
libcoretest: remove invocations of deprecated methods;  also add
    "allow(deprecated)" for testing a deprecated method itself.
libglob: use "cfg_attr".
libgraphviz: add a test for one of data constructors.
libgreen: remove a superfluous "use".
libnum: "allow(type_overflow)" for type cast into u8 in a test code.
librustc: names of static variables should be in upper case.
libserialize: v[i] instead of get().
libstd/ascii: to_lowercase() instead of to_lower().
libstd/bitflags: modify AnotherSetOfFlags to use i8 as its backend.
    It will serve better for testing various aspects of bitflags!.
libstd/collections: "allow(deprecated)" for testing a deprecated
    method itself.
libstd/io: remove invocations of deprecated methods and superfluous "use".
    Also add #[test] where it was missing.
libstd/num: introduce a helper function to effectively remove
    invocations of a deprecated method.
libstd/path and rand: remove invocations of deprecated methods and
    superfluous "use".
libstd/task and libsync/comm: "allow(deprecated)" for testing
    a deprecated method itself.
libsync/deque: remove superfluous "unsafe".
libsync/mutex and once: names of static variables should be in upper case.
libterm: introduce a helper function to effectively remove
    invocations of a deprecated method.

We still see a few warnings about using obsoleted native::task::spawn()
in the test modules for libsync.  I'm not sure how I should replace them
with std::task::TaksBuilder and native::task::NativeTaskBuilder
(dependency to libstd?)

Signed-off-by: NODA, Kai <[email protected]>

Author: nodakai

src/libstd/ascii.rs

@@ -582,15 +582,15 @@ mod tests {
         assert_eq!('A'.to_ascii().to_char(), 'A');
         assert_eq!('A'.to_ascii().to_byte(), 65u8);
 
-        assert_eq!('A'.to_ascii().to_lower().to_char(), 'a');
-        assert_eq!('Z'.to_ascii().to_lower().to_char(), 'z');
-        assert_eq!('a'.to_ascii().to_upper().to_char(), 'A');
-        assert_eq!('z'.to_ascii().to_upper().to_char(), 'Z');
-
-        assert_eq!('@'.to_ascii().to_lower().to_char(), '@');
-        assert_eq!('['.to_ascii().to_lower().to_char(), '[');
-        assert_eq!('`'.to_ascii().to_upper().to_char(), '`');
-        assert_eq!('{'.to_ascii().to_upper().to_char(), '{');
+        assert_eq!('A'.to_ascii().to_lowercase().to_char(), 'a');
+        assert_eq!('Z'.to_ascii().to_lowercase().to_char(), 'z');
+        assert_eq!('a'.to_ascii().to_uppercase().to_char(), 'A');
+        assert_eq!('z'.to_ascii().to_uppercase().to_char(), 'Z');
+
+        assert_eq!('@'.to_ascii().to_lowercase().to_char(), '@');
+        assert_eq!('['.to_ascii().to_lowercase().to_char(), '[');
+        assert_eq!('`'.to_ascii().to_uppercase().to_char(), '`');
+        assert_eq!('{'.to_ascii().to_uppercase().to_char(), '{');
 
         assert!('0'.to_ascii().is_digit());
         assert!('9'.to_ascii().is_digit());