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test iterator chain type length blowup #71572

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Apr 29, 2020
Merged

test iterator chain type length blowup #71572

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31 changes: 31 additions & 0 deletions src/test/ui/iterators/issue-58952-filter-type-length.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,31 @@
// run-pass
//! This snippet causes the type length to blowup exponentially,
//! so check that we don't accidentially exceed the type length limit.
// FIXME: Once the size of iterator adaptors is further reduced,
// increase the complexity of this test.

fn main() {
let c = 2;
let bv = vec![2];
let b = bv
.iter()
.filter(|a| **a == c);

let _a = vec![1, 2, 3]
.into_iter()
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.filter(|a| b.clone().any(|b| *b == *a))
.collect::<Vec<_>>();
}