mirror of https://github.com/rust-lang/rust
76 lines
2.1 KiB
Rust
76 lines
2.1 KiB
Rust
//@ run-pass
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#![allow(unused_variables)]
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#![allow(non_upper_case_globals)]
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#![allow(dead_code)]
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// very simple test for a 'static static with default lifetime
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static STATIC_STR: &str = "&'static str";
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const CONST_STR: &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: &fn(&[u8]) -> &[u8] = &(id_u8_slice as fn(&[u8]) -> &[u8]);
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const CONST_SIMPLE_FN: &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: &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: &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: &fn(&u8, &u8, &u8) = &(multi_args as fn(&u8, &u8, &u8));
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const CONST_MULTI_FN: &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 = Foo { bools: &[true, false] };
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const CONST_FOO: Foo = Foo { bools: &[true, false] };
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type Bar<'a> = Foo<'a>;
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static STATIC_BAR: Bar = Bar { bools: &[true, false] };
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const CONST_BAR: Bar = 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: &Baz = &(baz as Baz);
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const CONST_BAZ: &Baz = &(baz as Baz);
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static BYTES: &[u8] = &[1, 2, 3];
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fn main() {
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// make sure that the lifetime is actually elided (and not defaulted)
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let x = &[1u8, 2, 3];
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STATIC_SIMPLE_FN(x);
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CONST_SIMPLE_FN(x);
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STATIC_BAZ(BYTES); // neees static lifetime
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CONST_BAZ(BYTES);
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// make sure this works with different lifetimes
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let a = &1;
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{
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let b = &2;
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let c = &3;
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CONST_MULTI_FN(a, b, c);
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}
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}
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