With this change, the lint checks all operations that are defined as
being capable of overflow in the Rust Reference.

This reports the sizes of the largest and second-largest variants.

Add lint for explicit deref and deref_mut method calls

This PR adds the lint `explicit_deref_method` that suggests replacing `deref()` and `deref_mut()` with `&*a` and `&mut *a`.

It doesn't lint inside macros.

This PR is the continuation of  rust-lang#3258.

changelog: Add lint `explicit_deref_method`.

Fixes: rust-lang#1566

Add lint on large non scalar const

This PR adds the new lint `non_scalar_const` that aims to warn against `const` declaration of large arrays. For performance, because of inlining, large arrays should be preferably declared as `static`.

Note: i made this one to warn on all const arrays, whether they are in a body function or not. I don't know if this is really necessary, i could just reduce this lint to variables out of function scope.

Fixes: rust-lang#400

changelog: add new lint for large non-scalar types declared as const

…flip1995

Disallow bit-shifting in integer_arithmetic

Make the `integer_arithmetic` lint detect all the operations that are defined as being capable of overflow in the [Rust Reference](https://doc.rust-lang.org/reference/expressions/operator-expr.html#overflow), by also linting for bit-shifting operations (`<<`, `>>`).

changelog: Disallow bit-shifting in `integer_arithmetic`

…=flip1995

large_enum_variant: Report sizes of variants

This reports the sizes of the largest and second-largest variants.

Closes rust-lang#5459

changelog: `large_enum_variant`: Report the sizes of the largest and second-largest variants.

…ip1995

Zero single char names

Fixes: rust-lang#4086

changelog:
- Make the inequality strict