added missing PatKind::Path + tests

clippy_lints/src/matches.rs

@@ -201,6 +201,7 @@ fn check_single_match_opt_like(cx: &LateContext, ex: &Expr, arms: &[Arm], expr:
             path.to_string()
         }
         PatKind::Binding(BindByValue(MutImmutable), ident, None) => ident.node.to_string(),
+        PatKind::Path(ref path) => path.to_string(),
         _ => return,
     };
 

clippy_lints/src/utils/hir.rs

@@ -148,6 +148,7 @@ impl<'a, 'tcx: 'a> SpanlessEq<'a, 'tcx> {
             (&PatKind::Binding(ref lb, ref li, ref lp), &PatKind::Binding(ref rb, ref ri, ref rp)) => {
                 lb == rb && li.node.as_str() == ri.node.as_str() && both(lp, rp, |l, r| self.eq_pat(l, r))
             }
+            (&PatKind::Path(ref l), &PatKind::Path(ref r)) => self.eq_path(l, r),
             (&PatKind::Lit(ref l), &PatKind::Lit(ref r)) => self.eq_expr(l, r),
             (&PatKind::QPath(ref ls, ref lp), &PatKind::QPath(ref rs, ref rp)) => {
                 self.eq_qself(ls, rs) && self.eq_path(lp, rp)

tests/compile-fail/matches.rs

@@ -216,6 +216,12 @@ fn overlapping() {
         11 ... 50 => println!("0 ... 10"),
         _ => (),
     }
+    
+    if let None = Some(42) {
+        // nothing
+    } else if let None = Some(42) {
+        // another nothing :-)
+    }
 }
 
 fn main() {