Vector of functions error message

[jariji]

a = Vector{Function}(undef, 5)
for i in 1:5
    a[i](t) = cos(i*t)
end
ERROR: syntax: invalid function name "a[i]" around

https://discourse.julialang.org/t/vector-of-functions/94811

This error says what the problem is and where, but not how to solve it, which is to use an anonymous function a[i] = t -> cos(i*t).

If there is tooling to help generate this kind of message that would be helpful.

[c42f]

This error arises from lowering, not the parser (even though it says syntax:!). So we can only fix this once we've got part of lowering implemented here.

Even then, it does seem tricky to generate a useful error message which relates to what the user intended in this case. (And also not confuse users who write some other invalid function definition syntax. There must be several ways to accidentally get this wrong.)