75 lines
1.9 KiB
Rust
75 lines
1.9 KiB
Rust
// check that misc. method calls are well-formed
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use std::marker::PhantomData;
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use std::ops::{Deref, Shl};
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#[derive(Copy, Clone)]
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struct S<'a, 'b: 'a> {
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marker: PhantomData<&'a &'b ()>,
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bomb: Option<&'b u32>
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}
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type S2<'a> = S<'a, 'a>;
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impl<'a, 'b> S<'a, 'b> {
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fn transmute_inherent(&self, a: &'b u32) -> &'a u32 {
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a
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}
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}
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fn return_dangling_pointer_inherent(s: S2) -> &u32 {
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let s = s;
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s.transmute_inherent(&mut 42) //~ ERROR cannot return value referencing temporary value
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}
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impl<'a, 'b> Deref for S<'a, 'b> {
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type Target = &'a u32;
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fn deref(&self) -> &&'a u32 {
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self.bomb.as_ref().unwrap()
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}
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}
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fn return_dangling_pointer_coerce(s: S2) -> &u32 {
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let four = 4;
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let mut s = s;
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s.bomb = Some(&four);
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&s //~ ERROR cannot return value referencing local variable `four`
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}
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fn return_dangling_pointer_unary_op(s: S2) -> &u32 {
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let four = 4;
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let mut s = s;
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s.bomb = Some(&four);
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&*s //~ ERROR cannot return value referencing local variable `four`
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}
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impl<'a, 'b> Shl<&'b u32> for S<'a, 'b> {
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type Output = &'a u32;
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fn shl(self, t: &'b u32) -> &'a u32 { t }
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}
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fn return_dangling_pointer_binary_op(s: S2) -> &u32 {
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let s = s;
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s << &mut 3 //~ ERROR cannot return value referencing temporary value
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}
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fn return_dangling_pointer_method(s: S2) -> &u32 {
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let s = s;
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s.shl(&mut 3) //~ ERROR cannot return value referencing temporary value
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}
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fn return_dangling_pointer_ufcs(s: S2) -> &u32 {
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let s = s;
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S2::shl(s, &mut 3) //~ ERROR cannot return value referencing temporary value
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}
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fn main() {
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let s = S { marker: PhantomData, bomb: None };
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let _inherent_dp = return_dangling_pointer_inherent(s);
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let _coerce_dp = return_dangling_pointer_coerce(s);
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let _unary_dp = return_dangling_pointer_unary_op(s);
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let _binary_dp = return_dangling_pointer_binary_op(s);
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let _method_dp = return_dangling_pointer_method(s);
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let _ufcs_dp = return_dangling_pointer_ufcs(s);
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}
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