Don't lint accidental "prefixes" on enum variants

Author: oli-obk

clippy_lints/src/enum_variants.rs

@@ -160,7 +160,9 @@ fn check_variant(
     for var in &def.variants {
         let name = var2str(var);
         if partial_match(item_name, &name) == item_name_chars {
-            span_lint(cx, lint, var.span, "Variant name starts with the enum's name");
+            if name.chars().nth(item_name_chars).map_or(false, |c| !c.is_lowercase()) {
+                span_lint(cx, lint, var.span, "Variant name starts with the enum's name");
+            }
         }
         if partial_rmatch(item_name, &name) == item_name_chars {
             span_lint(cx, lint, var.span, "Variant name ends with the enum's name");

tests/ui/enum_variants.rs

@@ -102,4 +102,18 @@ mod allowed {
     }
 }
 
+// should not lint
+enum Pat {
+    Foo,
+    Bar,
+    Path,
+}
+
+// should not lint
+enum N {
+    Pos,
+    Neg,
+    Float,
+}
+
 fn main() {}