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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/consts/assoc_const_generic_impl.rs | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/test/ui/consts/assoc_const_generic_impl.rs b/src/test/ui/consts/assoc_const_generic_impl.rs new file mode 100644 index 000000000..71d947b0c --- /dev/null +++ b/src/test/ui/consts/assoc_const_generic_impl.rs @@ -0,0 +1,22 @@ +// build-fail + +#![warn(const_err)] + +trait ZeroSized: Sized { + const I_AM_ZERO_SIZED: (); + fn requires_zero_size(self); +} + +impl<T: Sized> ZeroSized for T { + const I_AM_ZERO_SIZED: () = [()][std::mem::size_of::<Self>()]; //~ WARN any use of this value + //~| WARN this was previously accepted by the compiler but is being phased out + fn requires_zero_size(self) { + let () = Self::I_AM_ZERO_SIZED; //~ ERROR erroneous constant encountered + println!("requires_zero_size called"); + } +} + +fn main() { + ().requires_zero_size(); + 42_u32.requires_zero_size(); +} |