From 94a0819fe3a0d679c3042a77bfe6a2afc505daea Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:11:28 +0200 Subject: Adding upstream version 1.66.0+dfsg1. Signed-off-by: Daniel Baumann --- .../hrtb-cache-issue-54302.rs | 24 ++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 src/test/ui/higher-rank-trait-bounds/hrtb-cache-issue-54302.rs (limited to 'src/test/ui/higher-rank-trait-bounds/hrtb-cache-issue-54302.rs') diff --git a/src/test/ui/higher-rank-trait-bounds/hrtb-cache-issue-54302.rs b/src/test/ui/higher-rank-trait-bounds/hrtb-cache-issue-54302.rs new file mode 100644 index 000000000..a20d03c77 --- /dev/null +++ b/src/test/ui/higher-rank-trait-bounds/hrtb-cache-issue-54302.rs @@ -0,0 +1,24 @@ +// Regression test for #54302. +// +// We were incorrectly using the "evaluation cache" (which ignored +// region results) to conclude that `&'static str: Deserialize`, even +// though it would require that `for<'de> 'de: 'static`, which is +// clearly false. + +trait Deserialize<'de> {} + +trait DeserializeOwned: for<'de> Deserialize<'de> {} +impl DeserializeOwned for T where T: for<'de> Deserialize<'de> {} + +// Based on this impl, `&'static str` only implements Deserialize<'static>. +// It does not implement for<'de> Deserialize<'de>. +impl<'de: 'a, 'a> Deserialize<'de> for &'a str {} + +fn main() { + fn assert_deserialize_owned() {} + assert_deserialize_owned::<&'static str>(); //~ ERROR + + // It correctly does not implement for<'de> Deserialize<'de>. + // fn assert_hrtb Deserialize<'de>>() {} + // assert_hrtb::<&'static str>(); +} -- cgit v1.2.3