Why won't julia ERROR if a variable is not defined when scheduling?

New to Julia
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13

Some context to what @sgaure is saying:

  • the built-in syntax for functions in Julia is just syntax sugar for:

    • defining a new type, if it’s a new function

    • adding a method to the type making it callable

  • in Julia, any type can be callable, just add a method

  • in Julia, new types can be struct or mutable struct (or abstract type, but obviously those don’t have instances, so they are not relevant here)

TBH I’m not completely sure what @sgaure’s point was either. I think they’re saying that some closures get lowered to a mutable struct, but I’m not sure if that’s true.