Rollup merge of #69551 - matthiaskrgr:len_zero, r=Mark-Simulacrum

use is_empty() instead of len() == x  to determine if structs are empty.

2 files changed, 2 insertions, 2 deletions

diff --git a/src/librustc_builtin_macros/concat.rs b/src/librustc_builtin_macros/concat.rs
index ed65611da61..1f1c8b8d21e 100644
--- a/src/librustc_builtin_macros/concat.rs
+++ b/src/librustc_builtin_macros/concat.rs
@@ -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();
diff --git a/src/librustc_builtin_macros/format.rs b/src/librustc_builtin_macros/format.rs
index ad47e09aa67..0684662b2bf 100644
--- a/src/librustc_builtin_macros/format.rs
+++ b/src/librustc_builtin_macros/format.rs
@@ -1096,7 +1096,7 @@ pub fn expand_preparsed_format_args(
         cx.str_pieces.push(s);
     }
 
-    if cx.invalid_refs.len() >= 1 {
+    if !cx.invalid_refs.is_empty() {
         cx.report_invalid_references(numbered_position_args);
     }