[llvm-branch-commits] [clang] 9a93aae - [Clang] Fixed auto parsing regression with brace initialization (#210347)

[Douglas Yung via llvm-branch-commits]

Author: Tony Guillot
Date: 2026-07-22T13:51:11Z
New Revision: 9a93aaef36ded17830dd27905f2e61dbe322d33c

URL: https://github.com/llvm/llvm-project/commit/9a93aaef36ded17830dd27905f2e61dbe322d33c
DIFF: https://github.com/llvm/llvm-project/commit/9a93aaef36ded17830dd27905f2e61dbe322d33c.diff

LOG: [Clang] Fixed auto parsing regression with brace initialization (#210347)

The PR #208552 has introduced a regression where brace initialization
was not taken into account `auto foo{12}`. It was also breaking
`dcl.type.general` p2 rules, which is also now tested.

(cherry picked from commit d592aa5a10f44164cd403257270802eb2a4b123a)

Added: 
    clang/test/CXX/dcl/dcl.spec/dcl.type/dcl.type.general/p2.cpp

Modified: 
    clang/lib/Parse/ParseDecl.cpp

Removed: 
    


################################################################################
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 
diff erent kind of symbol}}
+}
+
+typedef float bar;
+void func2() {
+  auto bar{16};
+}