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Diffstat (limited to '')
-rw-r--r-- | tests/ui/borrowck/borrowck-mutate-in-guard.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrowck-mutate-in-guard.rs b/tests/ui/borrowck/borrowck-mutate-in-guard.rs new file mode 100644 index 000000000..d80a9e815 --- /dev/null +++ b/tests/ui/borrowck/borrowck-mutate-in-guard.rs @@ -0,0 +1,34 @@ +#![feature(if_let_guard)] + +enum Enum<'a> { + A(&'a isize), + B(bool), +} + +fn if_guard() -> isize { + let mut n = 42; + let mut x = Enum::A(&mut n); + match x { + Enum::A(_) if { x = Enum::B(false); false } => 1, + //~^ ERROR cannot assign `x` in match guard + Enum::A(_) if { let y = &mut x; *y = Enum::B(false); false } => 1, + //~^ ERROR cannot mutably borrow `x` in match guard + Enum::A(p) => *p, + Enum::B(_) => 2, + } +} + +fn if_let_guard() -> isize { + let mut n = 42; + let mut x = Enum::A(&mut n); + match x { + Enum::A(_) if let Some(()) = { x = Enum::B(false); None } => 1, + //~^ ERROR cannot assign `x` in match guard + Enum::A(_) if let Some(()) = { let y = &mut x; *y = Enum::B(false); None } => 1, + //~^ ERROR cannot mutably borrow `x` in match guard + Enum::A(p) => *p, + Enum::B(_) => 2, + } +} + +fn main() {} |