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