Fix doc_markdown mixed case false positive

Author: phansch

clippy_lints/src/doc.rs

@@ -281,6 +281,10 @@ fn check_word(cx: &EarlyContext<'_>, word: &str, span: Span) {
         s != "_" && !s.contains("\\_") && s.contains('_')
     }
 
+    fn has_hyphen(s: &str) -> bool {
+        s != "-" && s.contains('-')
+    }
+
     if let Ok(url) = Url::parse(word) {
         // try to get around the fact that `foo::bar` parses as a valid URL
         if !url.cannot_be_a_base() {
@@ -295,6 +299,11 @@ fn check_word(cx: &EarlyContext<'_>, word: &str, span: Span) {
         }
     }
 
+    // We assume that mixed-case words are not meant to be put inside bacticks. (Issue #2343)
+    if has_underscore(word) && has_hyphen(word) {
+        return;
+    }
+
     if has_underscore(word) || word.contains("::") || is_camel_case(word) {
         span_lint(
             cx,

tests/ui/doc.rs

@@ -177,3 +177,7 @@ fn issue_1832() {}
 
 /// Ok: CamelCase (It should not be surrounded by backticks)
 fn issue_2395() {}
+
+/// This should not cause the lint to trigger:
+/// #REQ-data-family.lint_partof_exists
+fn issue_2343() {}