1 files changed, 5 insertions, 2 deletions
diff --git a/src/file/source/mod.rs b/src/file/source/mod.rs
index 89f1a3c..67e2cf1 100644
--- a/src/file/source/mod.rs
+++ b/src/file/source/mod.rs
@@ -1,12 +1,15 @@
 pub mod file;
 pub mod string;
 
+use std::fmt::Debug;
 use std::error::Error;
 
 use source::Source;
 use super::FileFormat;
 
 /// Describes where the file is sourced
-pub trait FileSource {
-    fn resolve(&self, format_hint: Option<FileFormat>) -> Result<(Option<String>, String, FileFormat), Box<Error>>;
+pub trait FileSource: Debug + Clone {
+    fn resolve(&self,
+               format_hint: Option<FileFormat>)
+               -> Result<(Option<String>, String, FileFormat), Box<Error>>;
 }