From 1bbaa553416b67fd2de472829f465ca0b24186a2 Mon Sep 17 00:00:00 2001 From: "Felix S. Klock II" Date: Sat, 3 Nov 2018 02:03:04 +0100 Subject: [PATCH 1/1] Regression test for issue 55552. --- ...-ascribe-wildcard-to-structured-pattern.rs | 31 +++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 src/test/ui/borrowck/issue-55552-ascribe-wildcard-to-structured-pattern.rs diff --git a/src/test/ui/borrowck/issue-55552-ascribe-wildcard-to-structured-pattern.rs b/src/test/ui/borrowck/issue-55552-ascribe-wildcard-to-structured-pattern.rs new file mode 100644 index 00000000000..6d91fd3508a --- /dev/null +++ b/src/test/ui/borrowck/issue-55552-ascribe-wildcard-to-structured-pattern.rs @@ -0,0 +1,31 @@ +// compile-pass + +// rust-lang/rust#55552: The strategy pnkfelix landed in PR #55274 +// (for ensuring that NLL respects user-provided lifetime annotations) +// did not handle the case where the ascribed type has some expliit +// wildcards (`_`) mixed in, and it caused an internal compiler error +// (ICE). +// +// This test is just checking that we do not ICE when such things +// occur. + +struct X; +struct Y; +struct Z; + +struct Pair { x: X, y: Y } + +pub fn join(oper_a: A, oper_b: B) -> (RA, RB) +where A: FnOnce() -> RA + Send, + B: FnOnce() -> RB + Send, + RA: Send, + RB: Send +{ + (oper_a(), oper_b()) +} + +fn main() { + let ((_x, _y), _z): (_, Z) = join(|| (X, Y), || Z); + + let (Pair { x: _x, y: _y }, Z): (_, Z) = join(|| Pair { x: X, y: Y }, || Z); +} -- 2.44.0