add filter empty lines in empty-docs lint

Author: lucarlig

clippy_lints/src/empty_docs.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_help;
 use rustc_ast::ast::*;
 use rustc_lint::{EarlyContext, EarlyLintPass};
-use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_session::declare_lint_pass;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -35,6 +35,7 @@ fn trim_comment(comment: &str) -> String {
         .trim()
         .split("\n")
         .map(|comment| comment.trim().trim_matches('*').trim_matches('!'))
+        .filter(|line| !line.is_empty())
         .collect::<Vec<&str>>()
         .join("")
 }

tests/ui/empty_docs.stderr

@@ -1,5 +1,5 @@
 error: empty doc comment
-  --> $DIR/empty_docs.rs:11:5
+  --> tests/ui/empty_docs.rs:11:5
    |
 LL |     ///
    |     ^^^
@@ -9,15 +9,15 @@ LL |     ///
    = help: to override `-D warnings` add `#[allow(clippy::empty_docs)]`
 
 error: empty doc comment
-  --> $DIR/empty_docs.rs:13:5
+  --> tests/ui/empty_docs.rs:13:5
    |
 LL |     ///
    |     ^^^
    |
    = help: consider removing or fill it
 
 error: empty doc comment
-  --> $DIR/empty_docs.rs:16:5
+  --> tests/ui/empty_docs.rs:16:5
    |
 LL | /     /**
 LL | |      *
@@ -27,15 +27,15 @@ LL | |      */
    = help: consider removing or fill it
 
 error: empty doc comment
-  --> $DIR/empty_docs.rs:6:5
+  --> tests/ui/empty_docs.rs:6:5
    |
 LL |     //!
    |     ^^^
    |
    = help: consider removing or fill it
 
 error: empty doc comment
-  --> $DIR/empty_docs.rs:8:5
+  --> tests/ui/empty_docs.rs:8:5
    |
 LL |     //!!
    |     ^^^^