| undef
| zeroinitializer
| "<" ConstVector ">"
+ | "[" ConstVector "]"
+ | "[" "]"
+ | "c" ^ STRINGCONSTANT
+ | "{" ConstVector "}"
+ | "{" "}"
+ | "<" ^ "{" ConstVector "}" ^ ">"
+ | "<" ^ "{" "}" ^ ">"
| ConstExpr
| asm OptSideEffect STRINGCONSTANT ^ "," STRINGCONSTANT ;