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 --- ...ntravariant-use-covariant-in-second-position.rs | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 src/test/ui/regions/regions-variance-contravariant-use-covariant-in-second-position.rs (limited to 'src/test/ui/regions/regions-variance-contravariant-use-covariant-in-second-position.rs') diff --git a/src/test/ui/regions/regions-variance-contravariant-use-covariant-in-second-position.rs b/src/test/ui/regions/regions-variance-contravariant-use-covariant-in-second-position.rs new file mode 100644 index 000000000..f23ca537f --- /dev/null +++ b/src/test/ui/regions/regions-variance-contravariant-use-covariant-in-second-position.rs @@ -0,0 +1,29 @@ +// Test that a type which is covariant with respect to its region +// parameter yields an error when used in a contravariant way. +// +// Note: see variance-regions-*.rs for the tests that check that the +// variance inference works in the first place. + +// `S` is contravariant with respect to both parameters. +struct S<'a, 'b> { + f: &'a isize, + g: &'b isize, +} + +fn use_<'short,'long>(c: S<'long, 'short>, + s: &'short isize, + l: &'long isize, + _where:Option<&'short &'long ()>) { + + let _: S<'long, 'short> = c; // OK + let _: S<'short, 'short> = c; // OK + + // Test whether S<_,'short> <: S<_,'long>. Since + // 'short <= 'long, this would be true if the Contravariant type were + // covariant with respect to its parameter 'a. + + let _: S<'long, 'long> = c; + //~^ ERROR lifetime may not live long enough +} + +fn main() {} -- cgit v1.2.3