use clippy_utils::diagnostics::span_lint_and_then;

use rustc_ast::ast::{BindingMode, Pat, PatKind};

use rustc_lint::{EarlyContext, EarlyLintPass};

use rustc_session::declare_lint_pass;

declare_clippy_lint! {

/// ### What it does

/// Checks for usages of the `ref` keyword.

///

/// ### Why restrict this?

/// The `ref` keyword can be confusing for people unfamiliar with it, and often

/// it is more concise to use `&` instead.

///

/// ### Example

/// ```no_run

/// let opt = Some(5);

/// if let Some(ref foo) = opt {}

/// ```

/// Use instead:

/// ```no_run

/// let opt = Some(5);

/// if let Some(foo) = &opt {}

/// ```

#[clippy::version = "1.71.0"]

pub REF_PATTERNS,

restriction,

"use of a ref pattern, e.g. Some(ref value)"

declare_lint_pass!(RefPatterns => [REF_PATTERNS]);

impl EarlyLintPass for RefPatterns {