fix failing test

Author: charles-zablit

lldb/include/lldb/Core/DemangledNameInfo.h

@@ -74,24 +74,48 @@ struct DemangledNameInfo {
     return BasenameRange.second > BasenameRange.first;
   }
 
+  /// Returns \c true if `BasenameRange` is empty.
+  bool isBasenameEmpty() const {
+    return BasenameRange.first == BasenameRange.second;
+  }
+
   /// Returns \c true if this object holds a valid scope range.
   bool hasScope() const { return ScopeRange.second > ScopeRange.first; }
 
+  /// Returns \c true if `ScopeRange` is empty.
+  bool isScopeEmpty() const { return ScopeRange.first == ScopeRange.second; }
+
   /// Returns \c true if this object holds a valid arguments range.
   bool hasArguments() const {
     return ArgumentsRange.second > ArgumentsRange.first;
   }
 
+  /// Returns \c true if `ArgumentsRange` is empty.
+  bool isArgumentsEmpty() const {
+    return ArgumentsRange.first == ArgumentsRange.second;
+  }
+
   /// Returns \c true if this object holds a valid qualifiers range.
   bool hasQualifiers() const {
     return QualifiersRange.second > QualifiersRange.first;
   }
 
+  /// Returns \c true if `QualifiersRange` is empty.
+  bool isQualifiersEmpty() const {
+    return QualifiersRange.first == QualifiersRange.second;
+  }
+
   /// Returns \c true if this object holds a valid prefix range.
   bool hasPrefix() const { return PrefixRange.second > PrefixRange.first; }
 
+  /// Returns \c true if `PrefixRange` is empty.
+  bool isPrefixEmpty() const { return PrefixRange.first == PrefixRange.second; }
+
   /// Returns \c true if this object holds a valid suffix range.
   bool hasSuffix() const { return SuffixRange.second > SuffixRange.first; }
+
+  /// Returns \c true if `SuffixRange` is empty.
+  bool isSuffixEmpty() const { return SuffixRange.first == SuffixRange.second; }
 };
 
 /// An OutputBuffer which keeps a record of where certain parts of a

lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp

@@ -314,7 +314,7 @@ GetDemangledFunctionQualifiers(const SymbolContext &sc) {
 
   auto [demangled_name, info] = *info_or_err;
 
-  if (!info.hasQualifiers())
+  if (!info.hasQualifiers() && !info.isQualifiersEmpty())
     return llvm::createStringError("Qualifiers range for '%s' is invalid.",
                                    demangled_name.data());
 
@@ -347,7 +347,7 @@ GetDemangledScope(const SymbolContext &sc) {
 
   auto [demangled_name, info] = *info_or_err;
 
-  if (!info.hasScope())
+  if (!info.hasScope() && !info.isScopeEmpty())
     return llvm::createStringError("Scope range for '%s' is invalid.",
                                    demangled_name.data());
 
@@ -364,7 +364,7 @@ GetDemangledFunctionSuffix(const SymbolContext &sc) {
 
   auto [demangled_name, info] = *info_or_err;
 
-  if (!info.hasSuffix())
+  if (!info.hasSuffix() && !info.isSuffixEmpty())
     return llvm::createStringError("Suffix range for '%s' is invalid.",
                                    demangled_name.data());