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### What it does
Checks for float literals with a precision greater
than that supported by the underlying type.
### Why is this bad?
Rust will truncate the literal silently.
### Example
```
let v: f32 = 0.123_456_789_9;
println!("{}", v); // 0.123_456_789
```
Use instead:
```
let v: f64 = 0.123_456_789_9;
println!("{}", v); // 0.123_456_789_9
```
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