src/statements-and-expressions.md - rust-lang/reference - Git at Google

 r[stmt-expr]
 # Statements and expressions

 Rust is _primarily_ an expression language.
 This means that most forms of value-producing or effect-causing evaluation are directed by the uniform syntax category of _expressions_.
 Each kind of expression can typically _nest_ within each other kind of expression, and rules for evaluation of expressions involve specifying both the value produced by the expression and the order in which its sub-expressions are themselves evaluated.

 In contrast, statements serve _mostly_ to contain and explicitly sequence expression evaluation.
	r[stmt-expr]
	# Statements and expressions

	Rust is _primarily_ an expression language.
	This means that most forms of value-producing or effect-causing evaluation are directed by the uniform syntax category of _expressions_.
	Each kind of expression can typically _nest_ within each other kind of expression, and rules for evaluation of expressions involve specifying both the value produced by the expression and the order in which its sub-expressions are themselves evaluated.

	In contrast, statements serve _mostly_ to contain and explicitly sequence expression evaluation.