Update trailingCommas rule to handle closure capture lists using a macro as the capture value (#2383)

Co-authored-by: calda <1811727+calda@users.noreply.github.com>

Sources/ParsingHelpers.swift

@@ -790,7 +790,7 @@ extension Formatter {
                 return true
             case .startOfScope("("), .startOfScope("["), .startOfScope("<"),
                  .endOfScope(")"), .endOfScope("]"), .endOfScope(">"),
-                 .keyword where token.isAttribute, _ where token.isComment:
+                 .keyword where token.isAttribute || token.isMacro, _ where token.isComment:
                 break
             case .keyword, .startOfScope, .endOfScope:
                 return false

Tests/Rules/TrailingCommasTests.swift

@@ -330,6 +330,44 @@ final class TrailingCommasTests: XCTestCase {
         testFormatting(for: input, rule: .trailingCommas)
     }
 
+    func testTrailingCommaNotAddedToCaptureListWithMacro() {
+        let input = """
+        { [
+            a = a(),
+            b = #b
+        ] in
+            a + b
+        }
+        """
+        testFormatting(for: input, rule: .trailingCommas)
+    }
+
+    func testTrailingCommaNotAddedToCaptureListWithMacroCollectionsOnly() {
+        let input = """
+        { [
+            a = a(),
+            b = #b
+        ] in
+            a + b
+        }
+        """
+        let options = FormatOptions(trailingCommas: .collectionsOnly)
+        testFormatting(for: input, rule: .trailingCommas, options: options)
+    }
+
+    func testTrailingCommaNotAddedToCaptureListWithMacroSwift6() {
+        let input = """
+        { [
+            a = a(),
+            b = #b
+        ] in
+            a + b
+        }
+        """
+        let options = FormatOptions(swiftVersion: "6.0")
+        testFormatting(for: input, rule: .trailingCommas, options: options)
+    }
+
     func testTrailingCommaNotAddedToArrayExtension() {
         let input = """
         extension [
@@ -1457,6 +1495,27 @@ final class TrailingCommasTests: XCTestCase {
         testFormatting(for: input, output, rule: .trailingCommas, options: options)
     }
 
+    func testTrailingCommasAddedToCaptureListWithMacro() {
+        let input = """
+        { [
+            a = a(),
+            b = #b
+        ] in
+            a + b
+        }
+        """
+        let output = """
+        { [
+            a = a(),
+            b = #b,
+        ] in
+            a + b
+        }
+        """
+        let options = FormatOptions(trailingCommas: .always, swiftVersion: "6.1")
+        testFormatting(for: input, output, rule: .trailingCommas, options: options)
+    }
+
     func testTrailingCommasRemovedFromSingleElementCaptureList() {
         let input = """
         { [