48 lines
1.5 KiB
Rust
48 lines
1.5 KiB
Rust
// Issue #53114: NLL's borrow check had some deviations from the old borrow
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// checker, and both had some deviations from our ideal state. This test
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// captures the behavior of how `_` bindings are handled with respect to how we
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// flag expressions that are meant to request unsafe blocks.
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#[derive(Copy, Clone)]
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struct I(i64);
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#[derive(Copy, Clone)]
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struct F(f64);
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union U { a: I, b: F }
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#[repr(packed)]
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struct P {
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a: &'static i8,
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b: &'static u32,
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}
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fn let_wild_gets_unsafe_field() {
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let u1 = U { a: I(0) };
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let u2 = U { a: I(1) };
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let p = P { a: &2, b: &3 };
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let _ = &p.b; //~ ERROR reference to packed field
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let _ = u1.a; // #53114: should eventually signal error as well
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let _ = &u2.a; //~ ERROR [E0133]
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// variation on above with `_` in substructure
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let (_,) = (&p.b,); //~ ERROR reference to packed field
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let (_,) = (u1.a,); //~ ERROR [E0133]
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let (_,) = (&u2.a,); //~ ERROR [E0133]
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}
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fn match_unsafe_field_to_wild() {
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let u1 = U { a: I(0) };
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let u2 = U { a: I(1) };
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let p = P { a: &2, b: &3 };
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match &p.b { _ => { } } //~ ERROR reference to packed field
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match u1.a { _ => { } } //~ ERROR [E0133]
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match &u2.a { _ => { } } //~ ERROR [E0133]
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// variation on above with `_` in substructure
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match (&p.b,) { (_,) => { } } //~ ERROR reference to packed field
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match (u1.a,) { (_,) => { } } //~ ERROR [E0133]
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match (&u2.a,) { (_,) => { } } //~ ERROR [E0133]
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}
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fn main() { }
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