diff --git a/src/lists.rs b/src/lists.rs
index 7aa0315f18c..97eea19f932 100644
--- a/src/lists.rs
+++ b/src/lists.rs
@@ -611,15 +611,30 @@ pub(crate) fn extract_post_comment(
     post_snippet: &str,
     comment_end: usize,
     separator: &str,
+    is_last: bool,
 ) -> Option<String> {
     let white_space: &[_] = &[' ', '\t'];
 
     // Cleanup post-comment: strip separators and whitespace.
     let post_snippet = post_snippet[..comment_end].trim();
+
+    let last_inline_comment_ends_with_separator = if is_last {
+        if let Some(line) = post_snippet.lines().last() {
+            line.ends_with(separator) && line.trim().starts_with("//")
+        } else {
+            false
+        }
+    } else {
+        false
+    };
+
     let post_snippet_trimmed = if post_snippet.starts_with(|c| c == ',' || c == ':') {
         post_snippet[1..].trim_matches(white_space)
     } else if let Some(stripped) = post_snippet.strip_prefix(separator) {
         stripped.trim_matches(white_space)
+    } else if last_inline_comment_ends_with_separator {
+        // since we're on the last item it's fine to keep any trailing separators in comments
+        post_snippet.trim_matches(white_space)
     }
     // not comment or over two lines
     else if post_snippet.ends_with(',')
@@ -748,14 +763,12 @@ fn next(&mut self) -> Option<Self::Item> {
                 .snippet_provider
                 .span_to_snippet(mk_sp((self.get_hi)(&item), next_start))
                 .unwrap_or("");
-            let comment_end = get_comment_end(
-                post_snippet,
-                self.separator,
-                self.terminator,
-                self.inner.peek().is_none(),
-            );
+            let is_last = self.inner.peek().is_none();
+            let comment_end =
+                get_comment_end(post_snippet, self.separator, self.terminator, is_last);
             let new_lines = has_extra_newline(post_snippet, comment_end);
-            let post_comment = extract_post_comment(post_snippet, comment_end, self.separator);
+            let post_comment =
+                extract_post_comment(post_snippet, comment_end, self.separator, is_last);
 
             self.prev_span_end = (self.get_hi)(&item) + BytePos(comment_end as u32);
 
diff --git a/tests/source/issue-5042/multi-line_comment_with_trailing_comma.rs b/tests/source/issue-5042/multi-line_comment_with_trailing_comma.rs
new file mode 100644
index 00000000000..5d171f32a1a
--- /dev/null
+++ b/tests/source/issue-5042/multi-line_comment_with_trailing_comma.rs
@@ -0,0 +1,24 @@
+fn main() {
+    // 5042 deals with trailing commas, not the indentation issue of these comments
+    // When a future PR fixes the inentation issues these test can be updated
+    let _ = std::ops::Add::add(10, 20
+        // ...
+        // ...,
+        );
+
+    let _ = std::ops::Add::add(10, 20
+        /* ... */
+        // ...,
+        );
+
+    let _ = std::ops::Add::add(10, 20
+        // ...,
+        // ...,
+        );
+
+    let _ = std::ops::Add::add(10, 20
+        // ...,
+        /* ...
+        */,
+        );
+}
diff --git a/tests/source/issue-5042/multi-line_comment_without_trailing_comma.rs b/tests/source/issue-5042/multi-line_comment_without_trailing_comma.rs
new file mode 100644
index 00000000000..b8a824b34b7
--- /dev/null
+++ b/tests/source/issue-5042/multi-line_comment_without_trailing_comma.rs
@@ -0,0 +1,24 @@
+fn main() {
+    // 5042 deals with trailing commas, not the indentation issue of these comments
+    // When a future PR fixes the inentation issues these test can be updated
+    let _ = std::ops::Add::add(10, 20
+        // ...
+        // ...
+        );
+
+    let _ = std::ops::Add::add(10, 20
+        /* ... */
+        // ...
+        );
+
+    let _ = std::ops::Add::add(10, 20
+        // ...
+        // ...
+        );
+
+    let _ = std::ops::Add::add(10, 20
+        // ...
+        /* ...
+        */
+        );
+}
diff --git a/tests/source/issue-5042/single-line_comment_with_trailing_comma.rs b/tests/source/issue-5042/single-line_comment_with_trailing_comma.rs
new file mode 100644
index 00000000000..bd765b7b41f
--- /dev/null
+++ b/tests/source/issue-5042/single-line_comment_with_trailing_comma.rs
@@ -0,0 +1,9 @@
+fn main() {
+    let _ = std::ops::Add::add(10, 20
+        // ...,
+        );
+
+    let _ = std::ops::Add::add(10, 20
+        /* ... */,
+        );
+}
diff --git a/tests/source/issue-5042/single-line_comment_without_trailing_comma.rs b/tests/source/issue-5042/single-line_comment_without_trailing_comma.rs
new file mode 100644
index 00000000000..2ed8de875ad
--- /dev/null
+++ b/tests/source/issue-5042/single-line_comment_without_trailing_comma.rs
@@ -0,0 +1,10 @@
+fn main() {
+    let _ = std::ops::Add::add(10, 20
+        // ...
+        );
+
+    let _ = std::ops::Add::add(10, 20
+        /* ... */
+        );
+}
+
diff --git a/tests/target/issue-5042/multi-line_comment_with_trailing_comma.rs b/tests/target/issue-5042/multi-line_comment_with_trailing_comma.rs
new file mode 100644
index 00000000000..1ae1212b488
--- /dev/null
+++ b/tests/target/issue-5042/multi-line_comment_with_trailing_comma.rs
@@ -0,0 +1,24 @@
+fn main() {
+    // 5042 deals with trailing commas, not the indentation issue of these comments
+    // When a future PR fixes the inentation issues these test can be updated
+    let _ = std::ops::Add::add(
+        10, 20, // ...
+           // ...,
+    );
+
+    let _ = std::ops::Add::add(
+        10, 20, /* ... */
+           // ...,
+    );
+
+    let _ = std::ops::Add::add(
+        10, 20, // ...,
+           // ...,
+    );
+
+    let _ = std::ops::Add::add(
+        10, 20, // ...,
+           /* ...
+            */
+    );
+}
diff --git a/tests/target/issue-5042/multi-line_comment_without_trailing_comma.rs b/tests/target/issue-5042/multi-line_comment_without_trailing_comma.rs
new file mode 100644
index 00000000000..30d174664c9
--- /dev/null
+++ b/tests/target/issue-5042/multi-line_comment_without_trailing_comma.rs
@@ -0,0 +1,24 @@
+fn main() {
+    // 5042 deals with trailing commas, not the indentation issue of these comments
+    // When a future PR fixes the inentation issues these test can be updated
+    let _ = std::ops::Add::add(
+        10, 20, // ...
+           // ...
+    );
+
+    let _ = std::ops::Add::add(
+        10, 20, /* ... */
+           // ...
+    );
+
+    let _ = std::ops::Add::add(
+        10, 20, // ...
+           // ...
+    );
+
+    let _ = std::ops::Add::add(
+        10, 20, // ...
+           /* ...
+            */
+    );
+}
diff --git a/tests/target/issue-5042/single-line_comment_with_trailing_comma.rs b/tests/target/issue-5042/single-line_comment_with_trailing_comma.rs
new file mode 100644
index 00000000000..87b651dd285
--- /dev/null
+++ b/tests/target/issue-5042/single-line_comment_with_trailing_comma.rs
@@ -0,0 +1,7 @@
+fn main() {
+    let _ = std::ops::Add::add(
+        10, 20, // ...,
+    );
+
+    let _ = std::ops::Add::add(10, 20 /* ... */);
+}
diff --git a/tests/target/issue-5042/single-line_comment_without_trailing_comma.rs b/tests/target/issue-5042/single-line_comment_without_trailing_comma.rs
new file mode 100644
index 00000000000..116df86a4b5
--- /dev/null
+++ b/tests/target/issue-5042/single-line_comment_without_trailing_comma.rs
@@ -0,0 +1,7 @@
+fn main() {
+    let _ = std::ops::Add::add(
+        10, 20, // ...
+    );
+
+    let _ = std::ops::Add::add(10, 20 /* ... */);
+}