question: throws mutabilityexception if this instance isimmutable . concode_field_sep boolean mutable concode_field_sep void setImmutable concode_elem_sep boolean isMutable concode_elem_sep boolean isImmutable concode_elem_sep void throwIfMutable
target: void function ( ) { if ( ! mutable ) { throw new MutabilityException ( "srini_string" ) ; } }