diff options
| -rw-r--r-- | src/test/compile-fail/lint-unused-mut-variables.rs | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/test/compile-fail/lint-unused-mut-variables.rs b/src/test/compile-fail/lint-unused-mut-variables.rs index 21cfadb9c79..49ba9421d65 100644 --- a/src/test/compile-fail/lint-unused-mut-variables.rs +++ b/src/test/compile-fail/lint-unused-mut-variables.rs @@ -47,6 +47,20 @@ fn main() { let x = |mut y: isize| 10; //~ ERROR: variable does not need to be mutable fn what(mut foo: isize) {} //~ ERROR: variable does not need to be mutable + let mut a = &mut 5; //~ ERROR: variable does not need to be mutable + *a = 4; + + let mut a = 5; + let mut b = (&mut a,); + *b.0 = 4; //~^ ERROR: variable does not need to be mutable + + fn mut_ref_arg(mut arg : &mut [u8]) -> &mut [u8] { + &mut arg[..] //~^ ERROR: variable does not need to be mutable + } + + let mut v : &mut Vec<()> = &mut vec![]; //~ ERROR: variable does not need to be mutable + v.push(()); + // positive cases let mut a = 2; a = 3; |