Auto merge of #68943 - ecstatic-morse:no-useless-drop-on-enum-variants, r=matthewjasper

[rust.git] / src / librustc_builtin_macros / concat.rs

diff --git a/src/librustc_builtin_macros/concat.rs b/src/librustc_builtin_macros/concat.rs
index c768402b479f8e8141246e084d76f0954582317b..e0ce37b95fcd6c9a60eafca8f961688e649118d9 100644 (file)
--- 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 syntax::ast;
-use syntax::symbol::Symbol;
-use syntax::tokenstream::TokenStream;
+use rustc_span::symbol::Symbol;
 
 use std::string::String;
 
@@ -49,7 +49,7 @@ 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();