# RUN: %lldb -b -o "language cplusplus demangle __ZN3Foo7DoThingEv" \
# RUN:   | FileCheck --check-prefix=DOUBLE-UNDERSCORE %s
# RUN: %lldb -b -o "language cplusplus demangle _ZN3Foo7DoThingEv" \
# RUN:   | FileCheck --check-prefix=SINGLE-UNDERSCORE %s
# RUN: not %lldb -b -o "language cplusplus demangle foo" 2>&1 \
# RUN:   | FileCheck --check-prefix=NOT-MANGLED %s
# RUN: not %lldb -b -o "language cplusplus demangle _ZN3Foo7DoThingEv foo" 2>&1 \
# RUN:   | FileCheck --check-prefix=MULTI-ARG %s
# RUN: %lldb -b -o "help language cplusplus demangle" \
# RUN:   | FileCheck --check-prefix=HELP-MESSAGE %s

# DOUBLE-UNDERSCORE: __ZN3Foo7DoThingEv ---> Foo::DoThing()

# SINGLE-UNDERSCORE: _ZN3Foo7DoThingEv ---> Foo::DoThing()

# NOT-MANGLED: error: foo is not a valid C++ mangled name

# MULTI-ARG: _ZN3Foo7DoThingEv ---> Foo::DoThing()
# MULTI-ARG: error: foo is not a valid C++ mangled name

# HELP-MESSAGE: Demangle a C++ mangled name.
# HELP-MESSAGE: Syntax: language cplusplus demangle [<mangled-name> ...]