mirror of https://github.com/rust-lang/rust
46 lines
900 B
Rust
46 lines
900 B
Rust
// Checks that derived implementations of Clone and Debug do not
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// contribute to dead code analysis (issue #84647).
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#![forbid(dead_code)]
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struct A { f: () }
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//~^ ERROR: field `f` is never read
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#[derive(Clone)]
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struct B { f: () }
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//~^ ERROR: field `f` is never read
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#[derive(Debug)]
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struct C { f: () }
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//~^ ERROR: field `f` is never read
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#[derive(Debug,Clone)]
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struct D { f: () }
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//~^ ERROR: field `f` is never read
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struct E { f: () }
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//~^ ERROR: field `f` is never read
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// Custom impl, still doesn't read f
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impl Clone for E {
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fn clone(&self) -> Self {
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Self { f: () }
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}
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}
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struct F { f: () }
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// Custom impl that actually reads f
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impl Clone for F {
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fn clone(&self) -> Self {
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Self { f: self.f }
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}
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}
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fn main() {
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let _ = A { f: () };
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let _ = B { f: () };
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let _ = C { f: () };
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let _ = D { f: () };
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let _ = E { f: () };
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let _ = F { f: () };
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}
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