borrowck-mutate-in-guard: update test.

src/test/ui/borrowck/borrowck-mutate-in-guard.rs

@@ -9,15 +9,11 @@ fn foo() -> isize {
  match x {
  Enum::A(_) if { x = Enum::B(false); false } => 1,
  //~^ ERROR cannot assign in a pattern guard
- //~| WARN cannot assign `x` in match guard
- //~| WARN this error has been downgraded to a warning for backwards compatibility
- //~| WARN this represents potential undefined behavior in your code and this warning will
+ //~| ERROR cannot assign `x` in match guard
  Enum::A(_) if { let y = &mut x; *y = Enum::B(false); false } => 1,
  //~^ ERROR cannot mutably borrow in a pattern guard
  //~| ERROR cannot assign in a pattern guard
- //~| WARN cannot mutably borrow `x` in match guard
- //~| WARN this error has been downgraded to a warning for backwards compatibility
- //~| WARN this represents potential undefined behavior in your code and this warning will
+ //~| ERROR cannot mutably borrow `x` in match guard
  Enum::A(p) => *p,
  Enum::B(_) => 2,
  }

src/test/ui/borrowck/borrowck-mutate-in-guard.stderr

@@ -5,45 +5,37 @@ LL | Enum::A(_) if { x = Enum::B(false); false } => 1,
  | ^^^^^^^^^^^^^^^^^^ assignment in pattern guard
 
 error[E0301]: cannot mutably borrow in a pattern guard
- --> $DIR/borrowck-mutate-in-guard.rs:15:38
+ --> $DIR/borrowck-mutate-in-guard.rs:13:38
  |
 LL | Enum::A(_) if { let y = &mut x; *y = Enum::B(false); false } => 1,
  | ^ borrowed mutably in pattern guard
  |
  = help: add `#![feature(bind_by_move_pattern_guards)]` to the crate attributes to enable
 
 error[E0302]: cannot assign in a pattern guard
- --> $DIR/borrowck-mutate-in-guard.rs:15:41
+ --> $DIR/borrowck-mutate-in-guard.rs:13:41
  |
 LL | Enum::A(_) if { let y = &mut x; *y = Enum::B(false); false } => 1,
  | ^^^^^^^^^^^^^^^^^^^ assignment in pattern guard
 
-warning[E0510]: cannot assign `x` in match guard
+error[E0510]: cannot assign `x` in match guard
  --> $DIR/borrowck-mutate-in-guard.rs:10:25
  |
 LL | match x {
  | - value is immutable in match guard
 LL | Enum::A(_) if { x = Enum::B(false); false } => 1,
  | ^^^^^^^^^^^^^^^^^^ cannot assign
- |
- = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
- = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
- = note: for more information, try `rustc --explain E0729`
 
-warning[E0510]: cannot mutably borrow `x` in match guard
- --> $DIR/borrowck-mutate-in-guard.rs:15:33
+error[E0510]: cannot mutably borrow `x` in match guard
+ --> $DIR/borrowck-mutate-in-guard.rs:13:33
  |
 LL | match x {
  | - value is immutable in match guard
 ...
 LL | Enum::A(_) if { let y = &mut x; *y = Enum::B(false); false } => 1,
  | ^^^^^^ cannot mutably borrow
- |
- = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
- = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
- = note: for more information, try `rustc --explain E0729`
 
-error: aborting due to 3 previous errors
+error: aborting due to 5 previous errors
 
 Some errors have detailed explanations: E0301, E0302, E0510.
 For more information about an error, try `rustc --explain E0301`.