24 lines
769 B
Rust
24 lines
769 B
Rust
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use crate::methods::get_hint_if_single_char_arg;
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use crate::utils::span_lint_and_sugg;
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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 super::SINGLE_CHAR_PATTERN;
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/// lint for length-1 `str`s for methods in `PATTERN_METHODS`
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pub(super) fn check(cx: &LateContext<'_>, _expr: &hir::Expr<'_>, arg: &hir::Expr<'_>) {
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let mut applicability = Applicability::MachineApplicable;
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if let Some(hint) = get_hint_if_single_char_arg(cx, arg, &mut applicability) {
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span_lint_and_sugg(
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cx,
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SINGLE_CHAR_PATTERN,
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arg.span,
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"single-character string constant used as pattern",
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"try using a `char` instead",
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hint,
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applicability,
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);
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}
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}
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