clippy 0.0.201

A bunch of helpful lints to avoid common pitfalls in Rust
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// should not warn on lossy casting in constant types
// because not supported yet
const C : i32 = 42;
const C_I64 : i64 = C as i64;

fn main() {
    // should suggest i64::from(c)
    let c : i32 = 42;
    let c_i64 : i64 = c as i64;
}