mirror of https://github.com/rust-lang/rust
61 lines
1.2 KiB
Rust
61 lines
1.2 KiB
Rust
//@ build-pass
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//@ ignore-compare-mode-next-solver (hangs)
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// Closures include captured types twice in a type tree.
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//
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// Wrapping one closure with another leads to doubling
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// the amount of types in the type tree.
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//
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// This test ensures that rust can handle
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// deeply nested type trees with a lot
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// of duplicated subtrees.
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fn dup(f: impl Fn(i32) -> i32) -> impl Fn(i32) -> i32 {
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move |a| f(a * 2)
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}
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fn main() {
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let f = |a| a;
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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// Compiler dies around here if it tries
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// to walk the tree exhaustively.
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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let f = dup(f);
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println!("Type size was at least {}", f(1));
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}
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