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Program ::= Statement+
Statement ::= (AssignmentStatement | PrintStatement | FunctionCallStatement) SEMICOLON
AssignmentStatement ::= "let" IDENTIFIER EQUALS Expression
PrintStatement ::= PRINT LPAREN Expression RPAREN -- TODO: this won't be needed once functions support arguments
FunctionCallStatement ::= IDENTIFIER LPAREN RPAREN
Expression ::= AdditiveExpression | FunctionDefinition
AdditiveExpression ::= PrimaryExpression ("+" AdditiveExpression)
PrimaryExpression ::= NUMBER | IDENTIFIER | FunctionCallStatement
FunctionDefinition ::= ARROW LBRACE Statement* ReturnStatement RBRACE
ReturnStatement ::= RETURN Expression SEMICOLON --TODO: I dont like this
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