31 lines
863 B
Rust
31 lines
863 B
Rust
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// Test that attempt to reborrow an `&mut` pointer in an aliasable
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// location yields an error.
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//
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// Example from src/middle/borrowck/doc.rs
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use std::util::swap;
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fn foo(t0: & &mut int) {
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let t1 = t0;
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let p: &int = &**t0; //~ ERROR cannot borrow an `&mut` in a `&` pointer
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**t1 = 22; //~ ERROR cannot assign
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}
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fn foo2(t0: &const &mut int) {
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// Note: reborrowing from an &const actually yields two errors, since it
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// is unsafe in two ways: we can't control the aliasing, and we can't
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// control the mutation.
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let t1 = t0;
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let p: &int = &**t0; //~ ERROR cannot borrow an `&mut` in a `&const` pointer
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//~^ ERROR unsafe borrow of aliasable, const value
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**t1 = 22; //~ ERROR cannot assign
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}
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fn foo3(t0: &mut &mut int) {
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let t1 = &mut *t0;
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let p: &int = &**t0; //~ ERROR cannot borrow
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**t1 = 22;
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}
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fn main() {
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}
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