[clang] [clang-format] Fix a regression in `PointerAlignment: Left` (PR #124085)

[Owen Pan via cfe-commits]

https://github.com/owenca created https://github.com/llvm/llvm-project/pull/124085

Don't insert a space between a type declaration r_paren and &/&&.

Fixes #124073.

>From 4a6d68388874e9b59936870b5c2c7d680a6bddc2 Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Wed, 22 Jan 2025 23:38:47 -0800
Subject: [PATCH] [clang-format] Fix a regression in `PointerAlignment: Left`

Don't insert a space between a type declaration r_paren and &/&&.

Fixes #124073.
---
 clang/lib/Format/TokenAnnotator.cpp   | 4 ++--
 clang/unittests/Format/FormatTest.cpp | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index bf5ee281c43119..f36cf7b638e0d2 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -5488,8 +5488,8 @@ bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
   }
   if ((Left.is(TT_TemplateOpener)) != (Right.is(TT_TemplateCloser)))
     return ShouldAddSpacesInAngles();
-  if (Left.is(tok::r_paren) && Right.is(TT_PointerOrReference) &&
-      Right.isOneOf(tok::amp, tok::ampamp)) {
+  if (Left.is(tok::r_paren) && Left.isNot(TT_TypeDeclarationParen) &&
+      Right.is(TT_PointerOrReference) && Right.isOneOf(tok::amp, tok::ampamp)) {
     return true;
   }
   // Space before TT_StructuredBindingLSquare.
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 61aa140dfdc9c0..265461561d2012 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -2084,7 +2084,6 @@ TEST_F(FormatTest, SeparatePointerReferenceAlignment) {
                Style);
 
   Style.PointerAlignment = FormatStyle::PAS_Left;
-  Style.ReferenceAlignment = FormatStyle::RAS_Pointer;
   verifyFormat("int* f1(int* a, int& b, int&& c);", Style);
   verifyFormat("int& f2(int&& c, int* a, int& b);", Style);
   verifyFormat("int&& f3(int& b, int&& c, int* a);", Style);
@@ -2118,6 +2117,7 @@ TEST_F(FormatTest, SeparatePointerReferenceAlignment) {
       "function<int(int&)> res1 = [](int& a) { return 0000000000000; },\n"
       "                    res2 = [](int& a) { return 0000000000000; };",
       Style);
+  verifyFormat("[](decltype(foo)& Bar) {}", Style);
 
   Style.AlignConsecutiveDeclarations.Enabled = true;
   Style.AlignConsecutiveDeclarations.AlignFunctionPointers = true;