Chapter 11 The OCaml language

5 Constants

constant	::=	integer-literal
	∣	int32-literal
	∣	int64-literal
	∣	nativeint-literal
	∣	float-literal
	∣	char-literal
	∣	string-literal
	∣	constr
	∣	false
	∣	true
	∣	()
	∣	begin end
	∣	[]
	∣	[\|\|]
	∣	`tag-name

See also the following language extension: extension literals.

The syntactic class of constants comprises literals from the four base types (integers, floating-point numbers, characters, character strings), the integer variants, and constant constructors from both normal and polymorphic variants, as well as the special constants false, true, (), [], and [||], which behave like constant constructors, and begin end, which is equivalent to ().