utils: Move codemap related utilities to a dedicated module

This commit adds a `codemap` module, and moves the `CodemapSpanUtils`
added in #857 to it. This is preparation for adding more `Codemap`
specific utilities.

Refs #434

1 files changed, 2 insertions, 1 deletions

diff --git a/src/patterns.rs b/src/patterns.rs
index 08d9db85201..a0b15a0f8c9 100644
--- a/src/patterns.rs
+++ b/src/patterns.rs
@@ -9,8 +9,9 @@
 // except according to those terms.
 
 use Indent;
+use codemap::SpanUtils;
 use rewrite::{Rewrite, RewriteContext};
-use utils::{CodeMapSpanUtils, wrap_str, format_mutability};
+use utils::{wrap_str, format_mutability};
 use lists::{format_item_list, itemize_list};
 use expr::{rewrite_unary_prefix, rewrite_pair, rewrite_tuple};
 use types::rewrite_path;