4.3 Expressions

An expression evaluates as a value and can be one of:

• A call to a function.

• A call to a macro.

• A code block.

• An if/else statement.

• A match statement.

• A loop statement.

Here is an example in the case of a code block denoted by curly brackets. The last statement does not end with a semicolon, as it is the way in Rust to mark a return value:

let y = {
  let x = 1;
  x + 5
};
y