[NoEmptyTrailingClosureParentheses] Do not remove parens if they contain comments.

Fixes #665.

Author: allevato

Sources/SwiftFormat/Rules/NoEmptyTrailingClosureParentheses.swift

@@ -27,7 +27,10 @@ public final class NoEmptyTrailingClosureParentheses: SyntaxFormatRule {
     guard
       let trailingClosure = node.trailingClosure,
       let leftParen = node.leftParen,
-      node.arguments.isEmpty
+      let rightParen = node.rightParen,
+      node.arguments.isEmpty,
+      !leftParen.trailingTrivia.hasAnyComments,
+      !rightParen.leadingTrivia.hasAnyComments
     else {
       return super.visit(node)
     }

Tests/SwiftFormatTests/Rules/NoEmptyTrailingClosureParenthesesTests.swift

@@ -83,4 +83,29 @@ final class NoEmptyTrailingClosureParenthesesTests: LintOrFormatRuleTestCase {
       ]
     )
   }
+
+  func testDoNotRemoveParensContainingOnlyComments() {
+    assertFormatting(
+      NoEmptyTrailingClosureParentheses.self,
+      input: """
+        greetEnthusiastically(/*oldArg: x*/) { "John" }
+        greetEnthusiastically(
+          /*oldArg: x*/
+        ) { "John" }
+        greetEnthusiastically(
+          // oldArg: x
+        ) { "John" }
+        """,
+      expected: """
+        greetEnthusiastically(/*oldArg: x*/) { "John" }
+        greetEnthusiastically(
+          /*oldArg: x*/
+        ) { "John" }
+        greetEnthusiastically(
+          // oldArg: x
+        ) { "John" }
+        """,
+      findings: []
+    )
+  }
 }