From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- .../ui/span/issue28498-reject-lifetime-param.rs | 36 ++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 src/test/ui/span/issue28498-reject-lifetime-param.rs (limited to 'src/test/ui/span/issue28498-reject-lifetime-param.rs') diff --git a/src/test/ui/span/issue28498-reject-lifetime-param.rs b/src/test/ui/span/issue28498-reject-lifetime-param.rs new file mode 100644 index 000000000..1e7190157 --- /dev/null +++ b/src/test/ui/span/issue28498-reject-lifetime-param.rs @@ -0,0 +1,36 @@ +// Demonstrate that having a lifetime param causes dropck to reject code +// that might indirectly access previously dropped value. +// +// Compare with run-pass/issue28498-ugeh-with-lifetime-param.rs + +#[derive(Debug)] +struct ScribbleOnDrop(String); + +impl Drop for ScribbleOnDrop { + fn drop(&mut self) { + self.0 = format!("DROPPED"); + } +} + +struct Foo<'a>(u32, &'a ScribbleOnDrop); + +impl<'a> Drop for Foo<'a> { + fn drop(&mut self) { + // Use of `may_dangle` is unsound, because destructor accesses borrowed data + // in `self.1` and we must force that to strictly outlive `self`. + println!("Dropping Foo({}, {:?})", self.0, self.1); + } +} + +fn main() { + let (last_dropped, foo0); + let (foo1, first_dropped); + + last_dropped = ScribbleOnDrop(format!("last")); + first_dropped = ScribbleOnDrop(format!("first")); + foo0 = Foo(0, &last_dropped); // OK + foo1 = Foo(1, &first_dropped); + //~^ ERROR `first_dropped` does not live long enough + + println!("foo0.1: {:?} foo1.1: {:?}", foo0.1, foo1.1); +} -- cgit v1.2.3