diff --git a/src/loops.rs b/src/loops.rs
index 2754f743caa9..9e5745950dd7 100644
--- a/src/loops.rs
+++ b/src/loops.rs
@@ -317,8 +317,8 @@ impl LateLintPass for LoopsPass {
                     span_lint(cx,
                               UNUSED_COLLECT,
                               expr.span,
-                              &format!("you are collect()ing an iterator and throwing away the result. Consider \
-                                        using an explicit for loop to exhaust the iterator"));
+                              &"you are collect()ing an iterator and throwing away the result. \
+                                Consider using an explicit for loop to exhaust the iterator");
                 }
             }
         }
diff --git a/src/methods.rs b/src/methods.rs
index 39f69f63d7b6..f776d5890b79 100644
--- a/src/methods.rs
+++ b/src/methods.rs
@@ -589,7 +589,7 @@ fn lint_extend(cx: &LateContext, expr: &Expr, args: &MethodArgs) {
         span_lint(cx,
                   EXTEND_FROM_SLICE,
                   expr.span,
-                  &format!("use of `extend` to extend a Vec by a slice"))
+                  &"use of `extend` to extend a Vec by a slice")
             .span_suggestion(expr.span,
                              "try this",
                              format!("{}.extend_from_slice({}{})",
diff --git a/src/types.rs b/src/types.rs
index 7cfcc76193d4..7521bc48046e 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -491,12 +491,12 @@ fn check_type(cx: &LateContext, ty: &Ty) {
         visitor.visit_ty(ty);
         visitor.score
     };
-    // println!("{:?} --> {}", ty, score);
+
     if score > 250 {
         span_lint(cx,
                   TYPE_COMPLEXITY,
                   ty.span,
-                  &format!("very complex type used. Consider factoring parts into `type` definitions"));
+                  &"very complex type used. Consider factoring parts into `type` definitions");
     }
 }