Weird behaviour with function variables leaking out of if blocks

[iago-lito]

According to the docs, if blocks are leaky. I can use it to my advantage with the following function f, but not with g, why?

@enum Case A B

f = function (case, x)
    if case == A
        coeff = 3
    elseif case == B
        coeff = 8
    end
    coeff * x
end

g = function (case, x)
    if case == A
        lambda(x) = 2x
    elseif case == B
        lambda(x) = x^2
    end
    lambda(x)
end

f(A, 5) #  15
f(B, 5) #  40

g(A, 5) #  25 .. wait, what?
g(B, 5) #  ERROR: lambda not defined. 

[nilshg]

Same code in if and else blocks, get UndefVarError only on else condition

Suppose I have a function with 2 arguments, and I want to make a new function with one of the arguments fixed to a value, depending on some condition. For example: fun(x,a) = a*x function foo(flag::Bool) if flag bar(x) = fun(x,2) else bar(x) = fun(x,2) end return bar end In this example the value of a is fixed to 2 on both branches, just for illustration. If I run this code in a script, foo(true) returns the desired function, but foo(false) gives ERROR: UndefVarErr…

[iago-lito]

Note that g(A, 5) passed with no warning and a completely undesired behaviour :\ Is there anything I can turn on to avoid this being silent?

[Oscar_Smith]

we should definitely make this a parser error.