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