From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/test/ui/rfc1623.rs | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 src/test/ui/rfc1623.rs

(limited to 'src/test/ui/rfc1623.rs')

diff --git a/src/test/ui/rfc1623.rs b/src/test/ui/rfc1623.rs
new file mode 100644
index 000000000..c0e13a5f5
--- /dev/null
+++ b/src/test/ui/rfc1623.rs
@@ -0,0 +1,99 @@
+#![allow(dead_code)]
+
+fn non_elidable<'a, 'b>(a: &'a u8, b: &'b u8) -> &'a u8 {
+    a
+}
+
+// The incorrect case without `for<'a>` is tested for in `rfc1623-2.rs`
+static NON_ELIDABLE_FN: &for<'a> fn(&'a u8, &'a u8) -> &'a u8 =
+    &(non_elidable as for<'a> fn(&'a u8, &'a u8) -> &'a u8);
+
+struct SomeStruct<'x, 'y, 'z: 'x> {
+    foo: &'x Foo<'z>,
+    bar: &'x Bar<'z>,
+    f: &'y dyn for<'a, 'b> Fn(&'a Foo<'b>) -> &'a Foo<'b>,
+}
+
+// Without this, the wf-check will fail early so we'll never see the
+// error in SOME_STRUCT's body.
+unsafe impl<'x, 'y, 'z: 'x> Sync for SomeStruct<'x, 'y, 'z> {}
+
+fn id<T>(t: T) -> T {
+    t
+}
+
+static SOME_STRUCT: &SomeStruct = &SomeStruct {
+    foo: &Foo { bools: &[false, true] },
+    bar: &Bar { bools: &[true, true] },
+    f: &id,
+    //~^ ERROR mismatched types
+    //~| ERROR mismatched types
+    //~| ERROR implementation of `FnOnce` is not general enough
+    //~| ERROR implementation of `FnOnce` is not general enough
+};
+
+// very simple test for a 'static static with default lifetime
+static STATIC_STR: &'static str = "&'static str";
+const CONST_STR: &'static str = "&'static str";
+
+// this should be the same as without default:
+static EXPLICIT_STATIC_STR: &'static str = "&'static str";
+const EXPLICIT_CONST_STR: &'static str = "&'static str";
+
+// a function that elides to an unbound lifetime for both in- and output
+fn id_u8_slice(arg: &[u8]) -> &[u8] {
+    arg
+}
+
+// one with a function, argument elided
+static STATIC_SIMPLE_FN: &'static fn(&[u8]) -> &[u8] = &(id_u8_slice as fn(&[u8]) -> &[u8]);
+const CONST_SIMPLE_FN: &'static fn(&[u8]) -> &[u8] = &(id_u8_slice as fn(&[u8]) -> &[u8]);
+
+// this should be the same as without elision
+static STATIC_NON_ELIDED_fN: &'static for<'a> fn(&'a [u8]) -> &'a [u8] =
+    &(id_u8_slice as for<'a> fn(&'a [u8]) -> &'a [u8]);
+const CONST_NON_ELIDED_fN: &'static for<'a> fn(&'a [u8]) -> &'a [u8] =
+    &(id_u8_slice as for<'a> fn(&'a [u8]) -> &'a [u8]);
+
+// another function that elides, each to a different unbound lifetime
+fn multi_args(a: &u8, b: &u8, c: &u8) {}
+
+static STATIC_MULTI_FN: &'static fn(&u8, &u8, &u8) = &(multi_args as fn(&u8, &u8, &u8));
+const CONST_MULTI_FN: &'static fn(&u8, &u8, &u8) = &(multi_args as fn(&u8, &u8, &u8));
+
+struct Foo<'a> {
+    bools: &'a [bool],
+}
+
+static STATIC_FOO: Foo<'static> = Foo { bools: &[true, false] };
+const CONST_FOO: Foo<'static> = Foo { bools: &[true, false] };
+
+type Bar<'a> = Foo<'a>;
+
+static STATIC_BAR: Bar<'static> = Bar { bools: &[true, false] };
+const CONST_BAR: Bar<'static> = Bar { bools: &[true, false] };
+
+type Baz<'a> = fn(&'a [u8]) -> Option<u8>;
+
+fn baz(e: &[u8]) -> Option<u8> {
+    e.first().map(|x| *x)
+}
+
+static STATIC_BAZ: &'static Baz<'static> = &(baz as Baz);
+const CONST_BAZ: &'static Baz<'static> = &(baz as Baz);
+
+static BYTES: &'static [u8] = &[1, 2, 3];
+
+fn main() {
+    let x = &[1u8, 2, 3];
+    let y = x;
+
+    // this works, so lifetime < `'static` is valid
+    assert_eq!(Some(1), STATIC_BAZ(y));
+    assert_eq!(Some(1), CONST_BAZ(y));
+
+    let y = &[1u8, 2, 3];
+
+    STATIC_BAZ(BYTES); // BYTES has static lifetime
+    CONST_BAZ(y); // interestingly this does not get reported
+}
-- 
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