#![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 }