diff options
Diffstat (limited to 'tests/ui/nll/issue-27282-reborrow-ref-mut-in-guard.rs')
-rw-r--r-- | tests/ui/nll/issue-27282-reborrow-ref-mut-in-guard.rs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tests/ui/nll/issue-27282-reborrow-ref-mut-in-guard.rs b/tests/ui/nll/issue-27282-reborrow-ref-mut-in-guard.rs new file mode 100644 index 000000000..ac06b2b01 --- /dev/null +++ b/tests/ui/nll/issue-27282-reborrow-ref-mut-in-guard.rs @@ -0,0 +1,30 @@ +// Issue 27282: This is a variation on issue-27282-move-ref-mut-into-guard.rs +// +// It reborrows instead of moving the `ref mut` pattern borrow. This +// means that our conservative check for mutation in guards will +// reject it. But I want to make sure that we continue to reject it +// (under NLL) even when that conservative check goes away. + +#![feature(if_let_guard)] + +fn main() { + let mut b = &mut true; + match b { + &mut false => {}, + ref mut r if { (|| { let bar = &mut *r; **bar = false; })(); + //~^ ERROR cannot borrow `r` as mutable, as it is immutable for the pattern guard + false } => { &mut *r; }, + &mut true => { println!("You might think we should get here"); }, + _ => panic!("surely we could never get here, since rustc warns it is unreachable."), + } + + let mut b = &mut true; + match b { + &mut false => {}, + ref mut r if let Some(()) = { (|| { let bar = &mut *r; **bar = false; })(); + //~^ ERROR cannot borrow `r` as mutable, as it is immutable for the pattern guard + None } => { &mut *r; }, + &mut true => {}, + _ => {}, + } +} |