Add lint for variable names that contain uppercase characters

src/test/compile-fail/lint-uppercase-variables.rs

@@ -0,0 +1,34 @@
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[deny(uppercase_variables)];
+
+use std::io::File;
+use std::io::IoError;
+
+fn test(Xx: uint) { //~ ERROR variable names should start with a lowercase character
+    println!("{}", Xx);
+}
+
+fn main() {
+    let Test: uint = 0; //~ ERROR variable names should start with a lowercase character
+    println!("{}", Test);
+
+    let mut f = File::open(&Path::new("something.txt"));
+    let mut buff = [0u8, ..16];
+    match f.read(buff) {
+        Ok(cnt) => println!("read this many bytes: {}", cnt),
+        Err(IoError{ kind: EndOfFile, .. }) => println!("Got end of file: {}", EndOfFile.to_str()),
+                        //~^ ERROR variable names should start with a lowercase character
+    }
+
+    test(1);
+}
+