release/23.x: [Clang] Fixed auto parsing regression with brace initialization (#210347)

[llvmbot]

Backport d592aa5

Requested by: @to268

[llvmbot]

@cor3ntin @AaronBallman What do you think about merging this PR to the release branch?

[llvmorg-github-actions]

@llvm/pr-subscribers-clang

Author: llvmbot

Changes

Backport d592aa5

Requested by: @to268

---

Full diff: https://github.com/llvm/llvm-project/pull/210441.diff

2 Files Affected:

• (modified) clang/lib/Parse/ParseDecl.cpp (+4-4)
• (added) clang/test/CXX/dcl/dcl.spec/dcl.type/dcl.type.general/p2.cpp (+11)

diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index 88f07bb104fcb..0825678acaf60 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -3879,10 +3879,10 @@ void Parser::ParseDeclarationSpecifiers(
       // when a variable name matches a type brought in by a using-directive.
       if (DS.getTypeSpecType() == DeclSpec::TST_auto) {
         Token Next = NextToken();
-        if (Next.isOneOf(tok::equal, tok::l_paren, tok::l_square, tok::amp,
-                         tok::ampamp, tok::star, tok::coloncolon, tok::comma,
-                         tok::semi, tok::colon, tok::greater, tok::r_paren,
-                         tok::arrow))
+        if (Next.isOneOf(tok::equal, tok::l_paren, tok::l_square, tok::l_brace,
+                         tok::amp, tok::ampamp, tok::star, tok::coloncolon,
+                         tok::comma, tok::semi, tok::colon, tok::greater,
+                         tok::r_paren, tok::arrow))
           goto DoneWithDeclSpec;
       }
 
diff --git a/clang/test/CXX/dcl/dcl.spec/dcl.type/dcl.type.general/p2.cpp b/clang/test/CXX/dcl/dcl.spec/dcl.type/dcl.type.general/p2.cpp
new file mode 100644
index 0000000000000..2255cdf11309c
--- /dev/null
+++ b/clang/test/CXX/dcl/dcl.spec/dcl.type/dcl.type.general/p2.cpp
@@ -0,0 +1,11 @@
+// RUN:  %clang_cc1 -std=c++2c -verify %s
+
+void func1() {
+  typedef float foo; // expected-note {{previous definition is here}}
+  auto foo{16};      // expected-error {{redefinition of 'foo' as different kind of symbol}}
+}
+
+typedef float bar;
+void func2() {
+  auto bar{16};
+}