Keywords

Keyword	Purpose
let	Declare an immutable variable
mut	Declare a mutable variable
fn	Declare a function
if	Conditional execution
else	Alternative conditional branch
while	While loop
return	Return a value from a function
import	Import a module
as	Assign an alias to an imported module
export	Mark a function for export
extern	Declare an external function
void	Void return type
break	Reserved loop-control keyword
true	Boolean literal
false	Boolean literal
int	Integer type
float	Floating-point type
bool	Boolean type
string	String type
print	Built-in output operation
input	Built-in input operation

The keyword list should be updated whenever the lexer adds or removes reserved words.