================================================= Command invocation without argument [no_argument] ================================================= message() --- (source_file (normal_command (identifier) ) ) ============================================================= Command invocation without argument with spaces [no_argument] ============================================================= message( ) --- (source_file (normal_command (identifier) ) ) ============================================================== Command invocation without argument with newline [no_argument] ============================================================== message( ) --- (source_file (normal_command (identifier) ) )