julia> comp = [
i * j
for i in 1:3,
j in 1:3
]
3×3 Array{Int64,2}:
1 2 3
2 4 6
3 6 9
private indexer ::= multiIndexer | singleIndexer
private infixIndexer ::= IN_KEYWORD | IN_SYM | EQ_SYM
singleIndexer ::= symbol infixIndexer endOfLine expr
multiIndexer ::=
LEFT_BRACKET endOfLine
symbol (commaSep expr|symbol)+ endOfLine
RIGHT_BRACKET
infixIndexer endOfLine
expr