[clang][USR] Encode full decl-context also for anon namespaces (#68325)

Otherwise we create collisions, e.g. a struct named Foo inside an
anonymous
namespace will get the same USR no matter what the surrounding
decl-context is.

1 files changed, 14 insertions, 0 deletions

diff --git a/clang/test/Index/USR/decl-context.cpp b/clang/test/Index/USR/decl-context.cpp
new file mode 100644
index 0000000..a57137a
--- /dev/null
+++ b/clang/test/Index/USR/decl-context.cpp
@@ -0,0 +1,14 @@
+// RUN: c-index-test core -print-source-symbols -- -std=c++20 %s | FileCheck %s
+
+namespace ns {
+namespace {
+struct Foo {};
+// CHECK: [[@LINE-1]]:8 | struct/C | Foo | c:decl-context.cpp@N@ns@aN@S@Foo
+}
+}
+namespace ns2 {
+namespace {
+struct Foo {};
+// CHECK: [[@LINE-1]]:8 | struct/C | Foo | c:decl-context.cpp@N@ns2@aN@S@Foo
+}
+}