src/tools/clippy/clippy_lints/src/misc_early/redundant_pattern.rs

   1 use clippy_utils::diagnostics::span_lint_and_sugg;
   2 use rustc_ast::ast::{Pat, PatKind};
   3 use rustc_errors::Applicability;
   4 use rustc_lint::EarlyContext;
   5
   6 use super::REDUNDANT_PATTERN;
   7
   8 pub(super) fn check(cx: &EarlyContext<'_>, pat: &Pat) {
   9     if let PatKind::Ident(ann, ident, Some(ref right)) = pat.kind {
  10         if let PatKind::Wild = right.kind {
  11             span_lint_and_sugg(
  12                 cx,
  13                 REDUNDANT_PATTERN,
  14                 pat.span,
  15                 &format!(
  16                     "the `{} @ _` pattern can be written as just `{}`",
  17                     ident.name, ident.name,
  18                 ),
  19                 "try",
  20                 format!("{}{}", ann.prefix_str(), ident.name),
  21                 Applicability::MachineApplicable,
  22             );
  23         }
  24     }
  25 }