use clippy_config::Conf;

use clippy_utils::diagnostics::span_lint_hir_and_then;

use clippy_utils::msrvs::{self, Msrv};

use clippy_utils::source::SpanRangeExt;

use clippy_utils::visitors::{is_local_used, local_used_once};

use clippy_utils::{is_trait_method, path_to_local_id};

use rustc_errors::Applicability;

use rustc_hir::{BindingMode, ExprKind, LetStmt, Node, PatKind, StmtKind};

use rustc_lint::{LateContext, LateLintPass};

use rustc_session::impl_lint_pass;

use rustc_span::sym;

declare_clippy_lint! {

/// ### What it does

/// Checks for cases where [`BuildHasher::hash_one`] can be used.

///

/// [`BuildHasher::hash_one`]: https://doc.rust-lang.org/std/hash/trait.BuildHasher.html#method.hash_one

///

/// ### Why is this bad?

/// It is more concise to use the `hash_one` method.

///

/// ### Example

/// ```no_run

/// use std::hash::{BuildHasher, Hash, Hasher};

/// use std::collections::hash_map::RandomState;

///

/// let s = RandomState::new();

/// let value = vec![1, 2, 3];

///

/// let mut hasher = s.build_hasher();

/// value.hash(&mut hasher);

/// let hash = hasher.finish();

/// ```

/// Use instead:

/// ```no_run

/// use std::hash::BuildHasher;

/// use std::collections::hash_map::RandomState;

///

/// let s = RandomState::new();

/// let value = vec![1, 2, 3];

///

/// let hash = s.hash_one(&value);

/// ```

#[clippy::version = "1.75.0"]

pub MANUAL_HASH_ONE,

complexity,

"manual implementations of `BuildHasher::hash_one`"

}

pub struct ManualHashOne {

msrv: Msrv,

}

impl ManualHashOne {

}

impl_lint_pass!(ManualHashOne => [MANUAL_HASH_ONE]);

impl LateLintPass<'_> for ManualHashOne {

}