From 9dfdb6b4bc42e5f1ddd2d94108a8ea6fdf07d416 Mon Sep 17 00:00:00 2001 From: Ralf Jung Date: Fri, 20 Mar 2026 15:53:58 +0100 Subject: [PATCH] test copy_specializes_from_vecdeque: reduce iteration count for Miri --- library/std/src/io/copy/tests.rs | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/library/std/src/io/copy/tests.rs b/library/std/src/io/copy/tests.rs index 25b1ece2745b..7bdba3a04416 100644 --- a/library/std/src/io/copy/tests.rs +++ b/library/std/src/io/copy/tests.rs @@ -97,16 +97,17 @@ fn copy_specializes_to_vec() { #[test] fn copy_specializes_from_vecdeque() { - let mut source = VecDeque::with_capacity(100 * 1024); - for _ in 0..20 * 1024 { + let num: usize = if cfg!(miri) { 512 } else { 20 * 1024 }; + let mut source = VecDeque::with_capacity(4 * num); + for _ in 0..num { source.push_front(0); } - for _ in 0..20 * 1024 { + for _ in 0..num { source.push_back(0); } let mut sink = WriteObserver { observed_buffer: 0 }; - assert_eq!(40 * 1024u64, io::copy(&mut source, &mut sink).unwrap()); - assert_eq!(20 * 1024, sink.observed_buffer); + assert_eq!(2 * num as u64, io::copy(&mut source, &mut sink).unwrap()); + assert_eq!(num, sink.observed_buffer); } #[test]