Scans until the closing parenthesis is found. Sets p to one char past it.
Provides space for at least 10 arguments.
Will point to Macro.Marker.Closing or Marker.Unclosed, or to textEnd if it wasn't found.
[arg0, arg1, arg2 ...].
See Implementation
Scans until the closing parenthesis is found. Sets p to one char past it.