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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/closures/issue-72408-nested-closures-exponential.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/closures/issue-72408-nested-closures-exponential.rs')
-rw-r--r-- | src/test/ui/closures/issue-72408-nested-closures-exponential.rs | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/test/ui/closures/issue-72408-nested-closures-exponential.rs b/src/test/ui/closures/issue-72408-nested-closures-exponential.rs new file mode 100644 index 000000000..2d6ba9365 --- /dev/null +++ b/src/test/ui/closures/issue-72408-nested-closures-exponential.rs @@ -0,0 +1,59 @@ +// build-pass + +// Closures include captured types twice in a type tree. +// +// Wrapping one closure with another leads to doubling +// the amount of types in the type tree. +// +// This test ensures that rust can handle +// deeply nested type trees with a lot +// of duplicated subtrees. + +fn dup(f: impl Fn(i32) -> i32) -> impl Fn(i32) -> i32 { + move |a| f(a * 2) +} + +fn main() { + let f = |a| a; + + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + + // Compiler dies around here if it tries + // to walk the tree exhaustively. + + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + let f = dup(f); + + println!("Type size was at least {}", f(1)); +} |