use clippy_utils::ast_utils::is_useless_with_eq_exprs; use clippy_utils::diagnostics::{span_lint, span_lint_and_then}; use clippy_utils::macros::{find_assert_eq_args, first_node_macro_backtrace}; use clippy_utils::{eq_expr_value, is_in_test_function}; use rustc_hir::{BinOpKind, Expr}; use rustc_lint::LateContext; use super::EQ_OP; pub(crate) fn check_assert<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) { if let Some((macro_call, macro_name)) = first_node_macro_backtrace(cx, e).find_map(|macro_call| { let name = cx.tcx.item_name(macro_call.def_id); matches!(name.as_str(), "assert_eq" | "assert_ne" | "debug_assert_eq" | "debug_assert_ne") .then(|| (macro_call, name)) }) && let Some((lhs, rhs, _)) = find_assert_eq_args(cx, e, macro_call.expn) && eq_expr_value(cx, lhs, rhs) && macro_call.is_local() && !is_in_test_function(cx.tcx, e.hir_id) { span_lint( cx, EQ_OP, lhs.span.to(rhs.span), &format!("identical args used in this `{macro_name}!` macro call"), ); } } pub(crate) fn check<'tcx>( cx: &LateContext<'tcx>, e: &'tcx Expr<'_>, op: BinOpKind, left: &'tcx Expr<'_>, right: &'tcx Expr<'_>, ) { if is_useless_with_eq_exprs(op.into()) && eq_expr_value(cx, left, right) && !is_in_test_function(cx.tcx, e.hir_id) { span_lint_and_then( cx, EQ_OP, e.span, &format!("equal expressions as operands to `{}`", op.as_str()), |diag| { if let BinOpKind::Ne = op && cx.typeck_results().expr_ty(left).is_floating_point() { diag.note("if you intended to check if the operand is NaN, use `.is_nan()` instead"); } }, ); } }