rustc: adjust span for error message to not trim last letter

Author: huonw

src/librustc/middle/resolve.rs

@@ -3079,7 +3079,7 @@ pub impl Resolver {
                 self.session.span_err(imports[index].span, "unresolved import");
             } else {
                 let err = fmt!("unresolved import (maybe you meant `%s::*`?)",
-                               sn.slice(0, sn.len() - 1)); // -1 to adjust for semicolon
+                               sn.slice(0, sn.len()));
                 self.session.span_err(imports[index].span, err);
             }
         }

src/test/compile-fail/unresolved-extern-mod-suggestion.rs

@@ -0,0 +1,14 @@
+// Copyright 2013 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.
+
+extern mod extra;
+use extra; //~ ERROR unresolved import (maybe you meant `extra::*`?)
+
+fn main() {}