Remove unnecessary to_string calls

This commit removes superfluous to_string calls from various places

2 files changed, 2 insertions, 2 deletions

diff --git a/src/libsyntax/print/pp.rs b/src/libsyntax/print/pp.rs
index 854aa80ca34..24ab4b38e54 100644
--- a/src/libsyntax/print/pp.rs
+++ b/src/libsyntax/print/pp.rs
@@ -111,7 +111,7 @@ impl Token {
 
 pub fn tok_str(t: Token) -> String {
     match t {
-        String(s, len) => return format!("STR({},{})", s, len).to_string(),
+        String(s, len) => return format!("STR({},{})", s, len),
         Break(_) => return "BREAK".to_string(),
         Begin(_) => return "BEGIN".to_string(),
         End => return "END".to_string(),
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index 97e99ca692d..87ed2076d61 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -243,7 +243,7 @@ pub fn arg_to_str(arg: &ast::Arg) -> String {
 
 pub fn visibility_qualified(vis: ast::Visibility, s: &str) -> String {
     match vis {
-        ast::Public => format!("pub {}", s).to_string(),
+        ast::Public => format!("pub {}", s),
         ast::Inherited => s.to_string()
     }
 }