3 files changed, 21 insertions, 1 deletions
diff --git a/tests/ui/lint/dropping_copy_types-macros.fixed b/tests/ui/lint/dropping_copy_types-macros.fixed
index a8ceedadc80..2a0c3988157 100644
--- a/tests/ui/lint/dropping_copy_types-macros.fixed
+++ b/tests/ui/lint/dropping_copy_types-macros.fixed
@@ -9,4 +9,7 @@ fn main() {
     let mut msg = String::new();
     let _ = writeln!(&mut msg, "test");
     //~^ ERROR calls to `std::mem::drop`
+
+    let _ = format_args!("a");
+    //~^ ERROR calls to `std::mem::drop`
 }
diff --git a/tests/ui/lint/dropping_copy_types-macros.rs b/tests/ui/lint/dropping_copy_types-macros.rs
index b249b0c868f..2272e0e8560 100644
--- a/tests/ui/lint/dropping_copy_types-macros.rs
+++ b/tests/ui/lint/dropping_copy_types-macros.rs
@@ -9,4 +9,7 @@ fn main() {
     let mut msg = String::new();
     drop(writeln!(&mut msg, "test"));
     //~^ ERROR calls to `std::mem::drop`
+
+    drop(format_args!("a"));
+    //~^ ERROR calls to `std::mem::drop`
 }
diff --git a/tests/ui/lint/dropping_copy_types-macros.stderr b/tests/ui/lint/dropping_copy_types-macros.stderr
index 117e9f4fe09..5048f6e3f18 100644
--- a/tests/ui/lint/dropping_copy_types-macros.stderr
+++ b/tests/ui/lint/dropping_copy_types-macros.stderr
@@ -17,5 +17,19 @@ LL -     drop(writeln!(&mut msg, "test"));
 LL +     let _ = writeln!(&mut msg, "test");
    |
 
-error: aborting due to 1 previous error
+error: calls to `std::mem::drop` with a value that implements `Copy` does nothing
+  --> $DIR/dropping_copy_types-macros.rs:13:5
+   |
+LL |     drop(format_args!("a"));
+   |     ^^^^^-----------------^
+   |          |
+   |          argument has type `Arguments<'_>`
+   |
+help: use `let _ = ...` to ignore the expression or result
+   |
+LL -     drop(format_args!("a"));
+LL +     let _ = format_args!("a");
+   |
+
+error: aborting due to 2 previous errors