diff options
Diffstat (limited to 'src/test/ui/derives/clone-debug-dead-code.rs')
-rw-r--r-- | src/test/ui/derives/clone-debug-dead-code.rs | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/test/ui/derives/clone-debug-dead-code.rs b/src/test/ui/derives/clone-debug-dead-code.rs new file mode 100644 index 000000000..ab49260c0 --- /dev/null +++ b/src/test/ui/derives/clone-debug-dead-code.rs @@ -0,0 +1,45 @@ +// Checks that derived implementations of Clone and Debug do not +// contribute to dead code analysis (issue #84647). + +#![forbid(dead_code)] + +struct A { f: () } +//~^ ERROR: field `f` is never read + +#[derive(Clone)] +struct B { f: () } +//~^ ERROR: field `f` is never read + +#[derive(Debug)] +struct C { f: () } +//~^ ERROR: field `f` is never read + +#[derive(Debug,Clone)] +struct D { f: () } +//~^ ERROR: field `f` is never read + +struct E { f: () } +//~^ ERROR: field `f` is never read +// Custom impl, still doesn't read f +impl Clone for E { + fn clone(&self) -> Self { + Self { f: () } + } +} + +struct F { f: () } +// Custom impl that actually reads f +impl Clone for F { + fn clone(&self) -> Self { + Self { f: self.f } + } +} + +fn main() { + let _ = A { f: () }; + let _ = B { f: () }; + let _ = C { f: () }; + let _ = D { f: () }; + let _ = E { f: () }; + let _ = F { f: () }; +} |