Parsing problems with expressions and types
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If this is a valid type:
    [3]int

then that creates a parsing ambiguity:
    int i = x
    [3]int arr
which could also be parsed as
    int i = x[3]...
--> this can be solved by forbidding newlines
between the array and index subexpressions.

how about this:
    [3]int a
    a =
    [3]int b
(where = is some operator that works on arrays)