48 lines
1.5 KiB
Rust
48 lines
1.5 KiB
Rust
use clippy_utils::diagnostics::span_lint_and_sugg;
|
|
use clippy_utils::is_trait_method;
|
|
use clippy_utils::source::snippet;
|
|
use clippy_utils::ty::is_type_diagnostic_item;
|
|
use if_chain::if_chain;
|
|
use rustc_errors::Applicability;
|
|
use rustc_hir as hir;
|
|
use rustc_lint::LateContext;
|
|
use rustc_middle::ty;
|
|
use rustc_span::symbol::sym;
|
|
|
|
use super::MAP_COLLECT_RESULT_UNIT;
|
|
|
|
pub(super) fn check(
|
|
cx: &LateContext<'_>,
|
|
expr: &hir::Expr<'_>,
|
|
iter: &hir::Expr<'_>,
|
|
map_fn: &hir::Expr<'_>,
|
|
collect_recv: &hir::Expr<'_>,
|
|
) {
|
|
if_chain! {
|
|
// called on Iterator
|
|
if is_trait_method(cx, collect_recv, sym::Iterator);
|
|
// return of collect `Result<(),_>`
|
|
let collect_ret_ty = cx.typeck_results().expr_ty(expr);
|
|
if is_type_diagnostic_item(cx, collect_ret_ty, sym::result_type);
|
|
if let ty::Adt(_, substs) = collect_ret_ty.kind();
|
|
if let Some(result_t) = substs.types().next();
|
|
if result_t.is_unit();
|
|
// get parts for snippet
|
|
then {
|
|
span_lint_and_sugg(
|
|
cx,
|
|
MAP_COLLECT_RESULT_UNIT,
|
|
expr.span,
|
|
"`.map().collect()` can be replaced with `.try_for_each()`",
|
|
"try this",
|
|
format!(
|
|
"{}.try_for_each({})",
|
|
snippet(cx, iter.span, ".."),
|
|
snippet(cx, map_fn.span, "..")
|
|
),
|
|
Applicability::MachineApplicable,
|
|
);
|
|
}
|
|
}
|
|
}
|