# Constrained - Fixed
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<small>[](https://azriel.im/dot_ix/?src=BYSwpgTghhDGwE8BcAoABGgzgewK5zCTQG8BfdNMADzFlwBcoAjAG0JPJQDtsATMAPpcoAWzCZUGHPljsARNIIA6CJjkVqtBszZE5muo1Zh13PoP6ZYEiotl71GA9uMOUZ-gLAjsAKxA2UngERIC8G4C7Oxo0hjrsoYC9O%2B5gvADm4pJYwbICXtEuumgA2nZgADSUeUZsALru9MDehLb0CGyBGGg8nvwAZlC4LPTtHRX00ER0qtgQALQADtggXPSQFE6pFmB9A0MZI9RjUBP4OLMLSysQKEA)</small>
</div>
```rust
fn main() {
let mut a = 1;
a = a + 1;
println!("a is: {a}");
}
```