43 lines
818 B
Rust
43 lines
818 B
Rust
use std::ops::Deref;
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use std::ops::DerefMut;
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struct Bar(u8);
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struct Foo(Bar);
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struct Emm(Foo);
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impl Deref for Bar{
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type Target = u8;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl Deref for Foo {
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type Target = Bar;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl Deref for Emm {
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type Target = Foo;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl DerefMut for Bar{
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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}
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}
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impl DerefMut for Foo {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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}
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}
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impl DerefMut for Emm {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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}
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}
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fn main() {
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let a = Emm(Foo(Bar(0)));
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let _: *mut u8 = &a; //~ ERROR mismatched types
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}
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