diff options
Diffstat (limited to 'src/test/ui/associated-types/defaults-cyclic-fail-1.rs')
-rw-r--r-- | src/test/ui/associated-types/defaults-cyclic-fail-1.rs | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/defaults-cyclic-fail-1.rs b/src/test/ui/associated-types/defaults-cyclic-fail-1.rs new file mode 100644 index 000000000..61ef01323 --- /dev/null +++ b/src/test/ui/associated-types/defaults-cyclic-fail-1.rs @@ -0,0 +1,40 @@ +#![feature(associated_type_defaults)] + +// Having a cycle in assoc. type defaults is okay... +trait Tr { + type A = Self::B; + type B = Self::A; +} + +impl Tr for () {} + +impl Tr for u8 { + type A = u8; +} + +impl Tr for u16 { + type B = (); +} + +impl Tr for u32 { + type A = (); + type B = u8; +} + +// ...but not in an impl that redefines one of the types. +impl Tr for bool { + type A = Box<Self::B>; + //~^ ERROR overflow evaluating the requirement `<bool as Tr>::B == _` +} +// (the error is shown twice for some reason) + +impl Tr for usize { + type B = &'static Self::A; + //~^ ERROR overflow evaluating the requirement `<usize as Tr>::A == _` +} + +fn main() { + // We don't check that the types project correctly because the cycle errors stop compilation + // before `main` is type-checked. + // `defaults-cyclic-pass-1.rs` does this. +} |