diff options
Diffstat (limited to 'src/test/ui/generator/generator-yielding-or-returning-itself.rs')
-rw-r--r-- | src/test/ui/generator/generator-yielding-or-returning-itself.rs | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/generator/generator-yielding-or-returning-itself.rs b/src/test/ui/generator/generator-yielding-or-returning-itself.rs new file mode 100644 index 000000000..30788e3c1 --- /dev/null +++ b/src/test/ui/generator/generator-yielding-or-returning-itself.rs @@ -0,0 +1,35 @@ +#![feature(generator_trait)] +#![feature(generators)] + +// Test that we cannot create a generator that returns a value of its +// own type. + +use std::ops::Generator; + +pub fn want_cyclic_generator_return<T>(_: T) + where T: Generator<Yield = (), Return = T> +{ +} + +fn supply_cyclic_generator_return() { + want_cyclic_generator_return(|| { + //~^ ERROR type mismatch + if false { yield None.unwrap(); } + None.unwrap() + }) +} + +pub fn want_cyclic_generator_yield<T>(_: T) + where T: Generator<Yield = T, Return = ()> +{ +} + +fn supply_cyclic_generator_yield() { + want_cyclic_generator_yield(|| { + //~^ ERROR type mismatch + if false { yield None.unwrap(); } + None.unwrap() + }) +} + +fn main() { } |