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Diffstat (limited to 'tests/ui/issues/issue-21245.rs')
-rw-r--r-- | tests/ui/issues/issue-21245.rs | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/tests/ui/issues/issue-21245.rs b/tests/ui/issues/issue-21245.rs new file mode 100644 index 000000000..c8e55a0cc --- /dev/null +++ b/tests/ui/issues/issue-21245.rs @@ -0,0 +1,56 @@ +// check-pass +#![allow(dead_code)] +// Regression test for issue #21245. Check that we are able to infer +// the types in these examples correctly. It used to be that +// insufficient type propagation caused the type of the iterator to be +// incorrectly unified with the `*const` type to which it is coerced. + +// pretty-expanded FIXME #23616 + +use std::ptr; + +trait IntoIterator { + type Iter: Iterator; + + fn into_iter2(self) -> Self::Iter; +} + +impl<I> IntoIterator for I where I: Iterator { + type Iter = I; + + fn into_iter2(self) -> I { + self + } +} + +fn desugared_for_loop_bad<T>(v: Vec<T>) { + match IntoIterator::into_iter2(v.iter()) { + mut iter => { + loop { + match ::std::iter::Iterator::next(&mut iter) { + ::std::option::Option::Some(x) => { + unsafe { ptr::read(x); } + }, + ::std::option::Option::None => break + } + } + } + } +} + +fn desugared_for_loop_good<T>(v: Vec<T>) { + match v.iter().into_iter() { + mut iter => { + loop { + match ::std::iter::Iterator::next(&mut iter) { + ::std::option::Option::Some(x) => { + unsafe { ptr::read(x); } + }, + ::std::option::Option::None => break + } + } + } + } +} + +fn main() {} |