Fix a bug that failed to find namespaces with tildes.

Author: jonsimantov

.github/workflows/cpp-packaging.yml

@@ -617,6 +617,7 @@ jobs:
         shell: bash
         run: |
           set -x
+          set +e
           if [[ "${{ matrix.sdk_platform }}" == "darwin" ]]; then
             nm=bin/llvm-nm
           else

scripts/merge_libraries.py

@@ -416,7 +416,7 @@ def get_top_level_namespaces(demangled_symbols):
   # It will specifically not match second-level or deeper namespaces:
   #   matched_namespace::unmatched_namespace::Class::Method()
   regex_top_level_namespaces = re.compile(
-      r"(?<![a-zA-Z0-9_])(?<!::)([a-zA-Z_][a-zA-Z0-9_]*)::(?=[a-zA-Z_])")
+      r"(?<![a-zA-Z0-9_])(?<!::)([a-zA-Z_~][a-zA-Z0-9_]*)::(?=[a-zA-Z_])")
   found_namespaces = set()
   for cppsymbol in demangled_symbols:
     m = regex_top_level_namespaces.findall(cppsymbol)