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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-18937.rs | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-18937.rs b/src/test/ui/issues/issue-18937.rs new file mode 100644 index 000000000..af85e5b2b --- /dev/null +++ b/src/test/ui/issues/issue-18937.rs @@ -0,0 +1,40 @@ +// Regression test for #18937. + +use std::fmt; + +#[derive(Debug)] +struct MyString<'a>(&'a String); + +struct B { + list: Vec<Box<dyn fmt::Debug>>, +} + +trait A<'a> { + fn foo<F>(&mut self, f: F) + where F: fmt::Debug + 'a, + Self: Sized; +} + +impl<'a> A<'a> for B { + fn foo<F>(&mut self, f: F) + where F: fmt::Debug + 'static, //~ ERROR impl has stricter + { + self.list.push(Box::new(f)); + } +} + +fn main() { + let mut b = B { list: Vec::new() }; + + // Create a borrowed pointer, put it in `b`, then drop what's borrowing it + let a = "hello".to_string(); + b.foo(MyString(&a)); + + // Drop the data which `b` has a reference to + drop(a); + + // Use the data, probably segfaulting + for b in b.list.iter() { + println!("{:?}", b); + } +} |