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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-54302.rs | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-54302.rs b/src/test/ui/issues/issue-54302.rs new file mode 100644 index 000000000..1bfaebc38 --- /dev/null +++ b/src/test/ui/issues/issue-54302.rs @@ -0,0 +1,19 @@ +trait Deserialize<'de> {} + +trait DeserializeOwned: for<'de> Deserialize<'de> {} +impl<T> 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() { + // Then why does it implement DeserializeOwned? This compiles. + fn assert_deserialize_owned<T: DeserializeOwned>() {} + assert_deserialize_owned::<&'static str>(); + //~^ ERROR not general enough + + // It correctly does not implement for<'de> Deserialize<'de>. + //fn assert_hrtb<T: for<'de> Deserialize<'de>>() {} + //assert_hrtb::<&'static str>(); +} |