bring back sugg::range

Author: frewsxcv

clippy_lints/src/utils/sugg.rs

@@ -175,6 +175,16 @@ impl<'a> Sugg<'a> {
         make_unop("&mut *", self)
     }
 
+    /// Convenience method to create the `<lhs>..<rhs>` or `<lhs>...<rhs>`
+    /// suggestion.
+    #[allow(dead_code)]
+    pub fn range(self, end: &Self, limit: ast::RangeLimits) -> Sugg<'static> {
+        match limit {
+            ast::RangeLimits::HalfOpen => make_assoc(AssocOp::DotDot, &self, end),
+            ast::RangeLimits::Closed => make_assoc(AssocOp::DotDotEq, &self, end),
+        }
+    }
+
     /// Add parenthesis to any expression that might need them. Suitable to the
     /// `self` argument of
     /// a method call (eg. to build `bar.foo()` or `(1 + 2).foo()`).