Fix some warnings.

src/librustpkg/tests.rs

@@ -12,7 +12,7 @@
 
 use context::Ctx;
 use std::hashmap::HashMap;
-use std::{io, libc, os, result, run, str};
+use std::{io, libc, os, run, str};
 use extra::tempfile::mkdtemp;
 use std::run::ProcessOutput;
 use installed_packages::list_installed_packages;

src/libsyntax/ext/ifmt.rs

@@ -685,7 +685,7 @@ pub fn expand_syntax_ext(ecx: @ExtCtxt, sp: span,
     };
     cx.fmtsp = efmt.span;
     let fmt = expr_to_str(ecx, efmt,
-                          ~"first argument to ifmt! must be a string literal.");
+                          "first argument to ifmt! must be a string literal.");
 
     let mut err = false;
     do parse::parse_error::cond.trap(|m| {