[clang-format] Correctly detect `!` as TT_NonNullAssertion after `default`.

Fixes https://github.com/llvm/llvm-project/issues/53153.

Depends on D121132.

Reviewed By: HazardyKnusperkeks, owenpan

Differential Revision: https://reviews.llvm.org/D121136

1 files changed, 20 insertions, 0 deletions

diff --git a/clang/unittests/Format/FormatTestCSharp.cpp b/clang/unittests/Format/FormatTestCSharp.cpp
index 2a76420..aa0304f 100644
--- a/clang/unittests/Format/FormatTestCSharp.cpp
+++ b/clang/unittests/Format/FormatTestCSharp.cpp
@@ -1078,6 +1078,26 @@ public class SaleItem
                MicrosoftStyle);
 }
 
+TEST_F(FormatTestCSharp, DefaultLiteral) {
+  FormatStyle Style = getGoogleStyle(FormatStyle::LK_CSharp);
+
+  verifyFormat(
+      "T[] InitializeArray<T>(int length, T initialValue = default) {}", Style);
+  verifyFormat("System.Numerics.Complex fillValue = default;", Style);
+  verifyFormat("int Value { get } = default;", Style);
+  verifyFormat("int Value { get } = default!;", Style);
+  verifyFormat(R"(//
+public record Person {
+  public string GetInit { get; init; } = default!;
+};)",
+               Style);
+  verifyFormat(R"(//
+public record Person {
+  public string GetSet { get; set; } = default!;
+};)",
+               Style);
+}
+
 TEST_F(FormatTestCSharp, CSharpSpaces) {
   FormatStyle Style = getGoogleStyle(FormatStyle::LK_CSharp);
   Style.SpaceBeforeSquareBrackets = false;