https://github.com/cor3ntin created
https://github.com/llvm/llvm-project/pull/89257
…sions
In a pack expression, if the id-expression is not valid, do no try to detect
whether it is a pack as that would lead to a crash trying to print a recovery
expression.
Fixes #88929
>From 6a000c3f2da8497a691000bfabc81211a85292a4 Mon Sep 17 00:00:00 2001
From: Corentin Jabot <corentinja...@gmail.com>
Date: Thu, 18 Apr 2024 18:02:45 +0200
Subject: [PATCH] [Clang] Do not try to diagnose parameter packs in invalid
pack expressions
In a pack expression, if the id-expression is not valid,
do no try to detect whether it is a pack as that would lead to a crash trying
to print a recovery expression.
Fixes #88929
---
clang/lib/Sema/SemaTemplateVariadic.cpp | 2 +-
clang/test/SemaCXX/cxx2c-pack-indexing.cpp | 6 ++++++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/clang/lib/Sema/SemaTemplateVariadic.cpp
b/clang/lib/Sema/SemaTemplateVariadic.cpp
index 4909414c0c78d4..2fdd5aeb736883 100644
--- a/clang/lib/Sema/SemaTemplateVariadic.cpp
+++ b/clang/lib/Sema/SemaTemplateVariadic.cpp
@@ -1084,7 +1084,7 @@ ExprResult Sema::ActOnPackIndexingExpr(Scope *S, Expr
*PackExpression,
Expr *IndexExpr,
SourceLocation RSquareLoc) {
bool isParameterPack = ::isParameterPack(PackExpression);
- if (!isParameterPack) {
+ if (!PackExpression->containsErrors() && !isParameterPack) {
CorrectDelayedTyposInExpr(IndexExpr);
Diag(PackExpression->getBeginLoc(), diag::err_expected_name_of_pack)
<< PackExpression;
diff --git a/clang/test/SemaCXX/cxx2c-pack-indexing.cpp
b/clang/test/SemaCXX/cxx2c-pack-indexing.cpp
index e13635383b6ca6..606715e6aacffd 100644
--- a/clang/test/SemaCXX/cxx2c-pack-indexing.cpp
+++ b/clang/test/SemaCXX/cxx2c-pack-indexing.cpp
@@ -154,3 +154,9 @@ void f() {
}
}
+
+namespace GH88929 {
+ bool b = a...[0]; // expected-error {{use of undeclared identifier 'a'}}
+ using E = P...[0]; // expected-error {{unknown type name 'P'}} \
+ // expected-error {{expected ';' after alias
declaration}}
+}
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