39 lines
1.2 KiB
Rust
39 lines
1.2 KiB
Rust
use clippy_utils::diagnostics::span_lint_and_sugg;
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use clippy_utils::ty::is_type_diagnostic_item;
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use clippy_utils::{is_expr_identity_function, is_trait_method};
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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_span::{source_map::Span, sym};
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use super::MAP_IDENTITY;
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pub(super) fn check(
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cx: &LateContext<'_>,
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expr: &hir::Expr<'_>,
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caller: &hir::Expr<'_>,
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map_arg: &hir::Expr<'_>,
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_map_span: Span,
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) {
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let caller_ty = cx.typeck_results().expr_ty(caller);
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if_chain! {
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if is_trait_method(cx, expr, sym::Iterator)
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|| is_type_diagnostic_item(cx, caller_ty, sym::Result)
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|| is_type_diagnostic_item(cx, caller_ty, sym::Option);
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if is_expr_identity_function(cx, map_arg);
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if let Some(sugg_span) = expr.span.trim_start(caller.span);
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then {
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span_lint_and_sugg(
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cx,
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MAP_IDENTITY,
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sugg_span,
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"unnecessary map of the identity function",
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"remove the call to `map`",
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String::new(),
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Applicability::MachineApplicable,
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)
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}
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}
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}
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