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diff --git a/tests/ui/borrowck/borrowck-escaping-closure-error-2.rs b/tests/ui/borrowck/borrowck-escaping-closure-error-2.rs
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+++ b/tests/ui/borrowck/borrowck-escaping-closure-error-2.rs
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+// Test that we give a custom error (E0373) for the case where a
+// closure is escaping current frame, and offer a suggested code edit.
+// I refrained from including the precise message here, but the
+// original text as of the time of this writing is:
+//
+// closure may outlive the current function, but it borrows `books`,
+// which is owned by the current function
+
+fn foo<'a>(x: &'a i32) -> Box<dyn FnMut() + 'a> {
+ let mut books = vec![1,2,3];
+ Box::new(|| books.push(4))
+ //~^ ERROR E0373
+}
+
+fn main() { }