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use clippy_utils::diagnostics::span_lint;
use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res};
use rustc_hir::{Expr, ExprKind};
use rustc_lint::LateContext;
use rustc_middle::ty::{self, Ty};
use super::CAST_ENUM_CONSTRUCTOR;
pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_expr: &Expr<'_>, cast_from: Ty<'_>) {
if matches!(cast_from.kind(), ty::FnDef(..))
&& let ExprKind::Path(path) = &cast_expr.kind
&& let Res::Def(DefKind::Ctor(CtorOf::Variant, CtorKind::Fn), _) = cx.qpath_res(path, cast_expr.hir_id)
{
span_lint(
cx,
CAST_ENUM_CONSTRUCTOR,
expr.span,
"cast of an enum tuple constructor to an integer",
);
}
}
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