From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:19:13 +0200 Subject: Merging upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- .../issue-27282-mutate-before-diverging-arm-2.rs | 40 ---------------------- 1 file changed, 40 deletions(-) delete mode 100644 src/test/ui/nll/issue-27282-mutate-before-diverging-arm-2.rs (limited to 'src/test/ui/nll/issue-27282-mutate-before-diverging-arm-2.rs') diff --git a/src/test/ui/nll/issue-27282-mutate-before-diverging-arm-2.rs b/src/test/ui/nll/issue-27282-mutate-before-diverging-arm-2.rs deleted file mode 100644 index 9c3e7e997..000000000 --- a/src/test/ui/nll/issue-27282-mutate-before-diverging-arm-2.rs +++ /dev/null @@ -1,40 +0,0 @@ -// This is testing an attempt to corrupt the discriminant of the match -// arm in a guard, followed by an attempt to continue matching on that -// corrupted discriminant in the remaining match arms. -// -// Basically this is testing that our new NLL feature of emitting a -// fake read on each match arm is catching cases like this. -// -// This case is interesting because it includes a guard that -// diverges, and therefore a single final fake-read at the very end -// after the final match arm would not suffice. -// -// It is also interesting because the access to the corrupted data -// occurs in the pattern-match itself, and not in the guard -// expression. - -struct ForceFnOnce; - -fn main() { - let mut x = &mut Some(&2); - let force_fn_once = ForceFnOnce; - match x { - &mut None => panic!("unreachable"), - &mut Some(&_) - if { - // ForceFnOnce needed to exploit #27282 - (|| { *x = None; drop(force_fn_once); })(); - //~^ ERROR cannot mutably borrow `x` in match guard [E0510] - false - } => {} - - // this segfaults if we corrupted the discriminant, because - // the compiler gets to *assume* that it cannot be the `None` - // case, even though that was the effect of the guard. - &mut Some(&2) - if { - panic!() - } => {} - _ => panic!("unreachable"), - } -} -- cgit v1.2.3