1 files changed, 9 insertions, 6 deletions
diff --git a/src/librustc_builtin_macros/concat.rs b/src/librustc_builtin_macros/concat.rs
index ed65611da61..4980ba0d9d3 100644
--- a/src/librustc_builtin_macros/concat.rs
+++ b/src/librustc_builtin_macros/concat.rs
@@ -1,7 +1,7 @@
+use rustc_ast::ast;
+use rustc_ast::tokenstream::TokenStream;
 use rustc_expand::base::{self, DummyResult};
 use rustc_span::symbol::Symbol;
-use syntax::ast;
-use syntax::tokenstream::TokenStream;
 
 use std::string::String;
 
@@ -26,9 +26,12 @@ pub fn expand_concat(
                 ast::LitKind::Char(c) => {
                     accumulator.push(c);
                 }
-                ast::LitKind::Int(i, ast::LitIntType::Unsigned(_))
-                | ast::LitKind::Int(i, ast::LitIntType::Signed(_))
-                | ast::LitKind::Int(i, ast::LitIntType::Unsuffixed) => {
+                ast::LitKind::Int(
+                    i,
+                    ast::LitIntType::Unsigned(_)
+                    | ast::LitIntType::Signed(_)
+                    | ast::LitIntType::Unsuffixed,
+                ) => {
                     accumulator.push_str(&i.to_string());
                 }
                 ast::LitKind::Bool(b) => {
@@ -49,7 +52,7 @@ pub fn expand_concat(
             }
         }
     }
-    if missing_literal.len() > 0 {
+    if !missing_literal.is_empty() {
         let mut err = cx.struct_span_err(missing_literal, "expected a literal");
         err.note("only literals (like `\"foo\"`, `42` and `3.14`) can be passed to `concat!()`");
         err.emit();