Guards (match and switch)

[emil14]

Guard

Guard won't have incoming -> (and thus won't be used in chained connection). Other than that, it's pretty much the same - match maps senders, switch maps enders with receivers.

Match

match {
    :a: 1
    :b: 2
    :c: 3
} -> ...

Switch

switch {
    :a: -> ...
    :b: -> ...
    :c: -> ...
}

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Related to #731 #725 #726 #747